238 篇文章
Those that fly above the ocean must be able to read the signs of fresh supplies, or perish.
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Those that fly above the ocean must be able to read the signs of fresh supplies, or perish. 飞越海洋的鸟类必须懂得寻找食物的踪迹, 不然就意味着死亡

They must get to the sea as soon as possible
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They must get to the sea as soon as possible 它们必须尽快爬向大海

but nest, they must.
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but nest, they must. 不过筑巢是必须的

To see what it does, you must switch off the lights.
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To see what it does, you must switch off the lights. 想看它要做什么,就要关掉灯光

If we are to follow, we must use a submarine.
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If we are to follow, we must use a submarine. 如果想要跟下去,必须乘潜水艇

Predators here must grab what they can, when they can
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Predators here must grab what they can, when they can 掠食者在这里想怎么吃就怎么吃

but the tuna must be wary.
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but the tuna must be wary. 金枪鱼必须机警地远离鲸鲨

If they are relaxed, it must be safe to come down to the ground and gather the food that lies there
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If they are relaxed, it must be safe to come down to the ground and gather the food that lies there 如果白斑鹿显得无拘无束 那么叶猴可以安心从地面上采集食物

so the leaves must be shed.
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so the leaves must be shed. 所以,必须落叶

and the trees must shut down and shed their leaves in preparation for the cold dark time ahead.
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and the trees must shut down and shed their leaves in preparation for the cold dark time ahead. 树木开始减缓代谢,树叶开始凋零, 以准备迎接寒冬的到来