你们有没有想过为什么落叶会变色？
有些昆虫可以变色。
画必须有坚硬的画架，这样画布才会绷紧，而且颜料不能变质、开裂或变色。
Paintings must have rigid stretchers so that the canvas will be taut, and the paint must not deteriorate, crack, or discolor.
叶片变得萎黄，茎短而纤细，并且在茎、叶柄和叶片下表面会出现花青素变色。
Leaves develop chlorosis; stems are short and slender, and anthocyanin discoloration occurs on stems, petioles, and lower leaf surfaces.
由于肉眼检查不能识别某些皮肤变色和皮肤癌，诊所的皮肤科医生需要对病人的皮肤组织进行测试。
Because visual inspection cannot reliably distinguish certain skin discolorations from skin cancers, dermatologists at clinics have needed to perform tests of skin tissue taken from patients.
然而，研究人员发现，一个长期以来众所周知的使食物变色和变硬的过程也可能与年龄相关的细胞和组织损伤有关。
Nevertheless, researchers have discovered that a process long known to discolor and toughen foods may also contribute to age related impairment of both cells and tissues.
如果他们决定投资第一眼看上去像是石板砖的变色瓷砖，因为这让他们高兴，那么我们凭什么去否定他们的选择呢？
If they decide to invest in color-changing tile that looks like slate at first glance, because it makes them happy, then who are we to deny their choices?
根据昆虫学家的说法，单个的蝗虫是安静的生物，但是当它们和同类的其他蝗虫放在一起时，它们会变得兴奋，变色，振动，甚至嗡嗡叫。
According to entomologists, single locusts are quiet creatures, but when locusts are placed with others of their species, they become excited, change color, vibrate, and even hum.
变色龙可以变成周围环境的颜色。
他像变色龙一样，可以不引人注意地融入背景之中。
Like a chameleon, he could merge unobtrusively into the background.
放在镜子上的变色龙是什么颜色的？
变色龙在这方面有着最惊人的能力。
The chameleon lizard has the most striking ability to do this.
那会变色的衣服怎么样呢？
这种材料是由一遇热就会变色的染料制成的。
This material is made with dyes that change colors when they get warm.
枞树告诉大自然母亲，他也想让他的叶子变色。
Fir Tree told Mother Nature that he wanted his leaves to change colours too.
镜子上的变色龙是一个完全展开的躯体。
我俩都是生物学家，便转而去讨论这难以捉摸的变色龙。
Both of us are biologists, so we swerved to talk about the elusive chameleon.
北美许多地区一年中最迷人的自然现象之一是秋天树叶的变色。
One of the most captivating natural events of the year in many areas throughout North America is the turning of the leaves in the fall.
在这个特别系列中，首先我们将着眼于大自然中最奇特的生物之一——变色龙。
In the first of this unusual series, we will look at the chameleon, one of nature's strangest creatures.
在反驳他是傻瓜或变色龙的谬见时，Riall 没有充分表现出他的矛盾性。
In rebutting the myth that he was a simpleton or a chameleon, Riall underplays his contradictions.
因为这种微乎其微的变色龙是如此之小，以至于它爬在人类的手指甲上还有多余的空间。
For this miniscule chameleon is so small that it can sit on a human thumbnail with room to spare.
他开发了光致变色材料的二芳基乙烯系列。
He developed the diarylethene family of photochromic materials.
它在水溶液中已经完全变色。
这将表明这种转变只是一种溶剂化变色现象。
This would indicate that the shift is simply a solvatochromis.
由于开花、结果和变色的延迟，收获时节也相应较晚。
Because of the delay in reaching bud break, bloom and veraison, a late harvest was anticipated.
地毯用过多年后已变色了。
树叶已开始变色，很快就是冬天了。
也许你正需要这些变色瓷砖。
Perhaps, these colour changing tiles are exactly what you want.
变色龙永远不可能有一致的颜色。
变色龙永远不可能有一致的颜色。
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