The colours are magnificent, but the question of exactly why some trees turn yellow or orange, and others red or purple, is something which has long puzzled scientists.
这些颜色很瑰丽，但究竟为什么有些树会变成黄色或橙色，而有些树会变成红色或紫色，这个问题一直困扰着科学家。
Choose a light yellow or orange colour.
选择一种明亮的黄色或橙色。
Everyone else knew a lot of the moves already and had yellow or orange belts.
那里每一个人都认识很多已经拥有蓝带或者橙带的学员。
North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil.
北美一年生植物，花通常黄色或橙色；主要生长在潮湿酸性土壤中。
Any of various American plants of the genus Tagetes, widely cultivated for their showy yellow or orange flowers.
万寿菊属的美洲热带植物，具有艳丽的黄色或桔红色的花朵。
Any of various old world passerine birds of the family oriolidae of which the males are characteristically black and bright yellow or orange.
黄鹂，金莺一种东半球黄鹂属燕雀鸟类，其雄鸟以黑色和鲜艳的黄色或桔黄色为特点。
Even dashes of yellow or orange in their ties may signal their recruitment as well as yellow shirts or other objects with that color for signalling.
佩戴着浅黄色或橙色的领带，可能预示着他们正在招聘，以及黄色衬衫或有色彩其他物体。
For yellow or orange chromium complex, their structure could be destroyed by means of heating the wastewater to raise its temperature or acidification.
对于黄色或橙色铬络合物，将废水进行预热以提高处理温度，或加酸酸化，都会使络合态铬离子结构破坏；
The dust, sulfuric acid, nitric acid and other particles in the haze, the scattering light with longer wavelength is much, so the haze appears yellow or orange gray.
由于灰尘、硫酸、硝酸等粒子组成的霾，其散射波长较长的光比较多，因而霾看起来呈黄色或橙灰色。
The same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.
同年，美国联邦航空管理局要求将这些实际上从未是黑色的盒子刷成橙色或黄色，以提高能见度。
What is still not fully understood, however, is why some trees resort to producing red pigments while others don't bother, and simply reveal their orange or yellow hues.
然而，至今仍不完全清楚，为什么有些树木倾向于制造红色素，而有些树木不去刻意制造色素，但还是会呈现出橙色或黄色。
This unmasking explains the autumn colours of yellow and orange, but not the brilliant reds and purples of trees such as the maple or sumac.
这一发现解释了秋天的颜色是黄色和橙色，而不是像枫树或漆树那样明亮的红色和紫色。
If you're used to munching on red tomatoes, try orange, or yellow, or serve purple cauliflower along with your usual white.
如果你经常吃红色的西红柿，试一试橙色、黄色或紫色的花椰菜代替通常所吃的白色的。
Students mark the main ideas and important details with a pen or pencil, yellow or blue or orange.
学生们用黄色、蓝色或橙色的钢笔或铅笔标出主要思想和重要细节。
In the sea, it is yellow, orange, grey, green, brown or even blue.
在海里，它是黄色、橙色、灰色、绿色、棕色，甚至蓝色。
Expose yourself to bright hues of the colors green, orange, yellow, or beige.
使自己身处在绿色、橘色、黄色和米色的明亮色调里。
If you're used to munching on red tomatoes, try orange or yellow, or serve purple cauliflower along with your usual white.
如果你经常吃红色的西红柿，那么试试橙色的或是黄色的，用紫色的花椰菜代替通常所吃白色的。
Squash Blossoms: the orange, yellow blossom found at the top of the squash can be cooked or eaten raw.
南瓜花：这种橙色或者黄色的长在南瓜科植物上得花能炒菜甚至生吃。
The fruit is a berry and comes in red, orange or yellow. It has a similar appearance to tomatoes, and is said to taste like a mixture between tomatoes and lemons.
科科纳果属于一种浆果，有红色、橙色和黄色，外型与西红柿相似，据说吃起来像西红柿和柠檬的混合味道。
Seven-spotted ladybug larvae are long, black, and spiky-looking with orange or yellow spots.
七星瓢虫的幼虫身体长，呈黑色，像道钉一般还带有橙色或黄色的花纹。
The skin can appear a variety of colours including brown, yellow, green or orange.
它们的皮肤能显示各种颜色，其中包括棕色、黄色、绿色或桔色。
The fruit is a berry and comes in red, orange or yellow.
果实属浆果类，颜色多为红、橘、黄。
Water refracts, or bends, the light, separating it into red, orange, yellow, green, blue, and violet
水把光线折射或弯曲，而分离为红、橙、黄、绿、蓝和紫色。
These contrasts are relative since yellow-green are cool next to red, orange or yellow, but would be considered warm next to blue-violet.
这些差异是相对的，黄绿色和红色、桔黄色或黄色相比是冷色但是和蓝紫色相比是暖色。
Amber is commonly yellow or honey colored, but hues range from light yellow to dark brown and include lemon yellow, orange, reddish brown and almost white.
琥珀通常是黄色或蜂蜜色，但是色调从淡黄色到黑褐色并且包括柠檬黄，橙色，红棕色和几乎白色。
Different colors such as blue, yellow, orange and red will represent different meteorological disasters or weather changes, the Municipal Meteorological authority revealed.
气象局官员介绍说，信号颜色分为蓝色、黄色、橙色和红色。不同的灯光颜色表示不同的气象灾害或天气变化。
Their colours range from brown to bright orange or yellow.
颜色从棕色、亮橘色或黄色都有。
Their colours range from brown to bright orange or yellow.
颜色从棕色、亮橘色或黄色都有。
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