They sleep by day and hunt by night.
他们白天睡觉，夜晚捕猎。
I see better at night than by day.
我在晚上比在白天看得清楚。
我们的儿子一天一天长大了。
The sun shines by day, and the moon shines by night.
太阳在白天光芒万丈，月亮在夜晚明亮；
They flutter through our dreams at night, they fly with us in our wheelings and circlings by day.
它们在夜里拍着翅膀，飞过我们的梦，在白天，它们和我们一起在天上盘旋。
You might say that this is a problem of their own making, one that they could avoid simply by changing their habits and hunting by day.
你可能会说这是他们自己造成的问题，只要他们改变习惯在白天狩猎，就能避免这个问题。
The cashflow from tenants is more stable than that from equities, where values zigzag day by day and dividends can suddenly be suspended by the management.
来自租户的现金流比来自股票的更稳定，后者的价值每天都在波动，管理层可能会突然停止发放股息。
It had long been thought that hummingbirds, which forage by day, pollinate its red flowers and that hawkmoths, which forage at night, pollinate its white flowers.
长期以来，人们一直认为，白天觅食的蜂鸟会给它的红色花朵授粉，而晚上觅食的鹰蛾会给它的白色花朵授粉。
Nocturnal animals sleep by day and hunt by night.
夜间活动的动物白天睡觉晚上猎食。
他们在一天天地改进。
The city, drab and dour by day, is transformed at night.
这座城市白天死气沉沉、单调乏味，晚上就完全变了样。
Ground squirrels are normally active by day and sleep at night.
地松鼠一般白天活跃晚上睡觉。
But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.
但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。
It involves a prince who is a white bear by night and a human by day.
其中有一位白天是人、晚上是白熊的王子。
Day by day his condition improved.
他的健康状况一天天好转。
Competition is getting hotter day by day.
竞争日趋白热化。
Engineer by day, Leo learned cooking at night school.
利奥白天是一名工程师，晚上会在夜校学习烹饪。
Those two books were my companions by day, and under my pillow at night.
这两本书白天与我为伴，晚上在枕下与我共眠。
Day by day, people began to realize that something big was happening on the lonely road.
一天天过去，人们开始意识到在这条孤独的道路上正在发生着一件大事。
It's getting warmer day by day.
天气越来越暖和了。
Increase the number of steps day by day.
一天天增加步数。
Our country is thriving and prospering day by day.
祖国日益繁荣昌盛。
Teachers expect all their students to make progress day by day.
老师希望所有学生每天都能取得进步。
With his hard work and great effort, day by day the young bamboo trees grew into a forest.
他孜孜不懈，苦心极力，小竹树一天天长成了一片竹林。
Day by day the plant grew taller and taller, and gradually the little girl became better and better.
植物一天天地越长越高，小女孩也逐渐变得越来越好。
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