160 篇文章
and, with it, half the indri families that once lived there.
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and, with it, half the indri families that once lived there. 而那里曾栖息着半数的大狐猴家族

to bask in the sunshine once again.
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to bask in the sunshine once again. 再一次沐浴在阳光之中

But once the sun sets,
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But once the sun sets, 但一旦太阳下山

But once on level ground, they're vulnerable.
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But once on level ground, they're vulnerable. 但回到平地上 他们就很容易遭到攻击

Once a year, they must all return to the sea to breed,
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Once a year, they must all return to the sea to breed, 每年它们都会回到海洋中进行繁殖

Once a year, the noddies arrive.
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Once a year, the noddies arrive. 每年白燕鸥都会来一次

Female dragons come into season only once a year.
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Female dragons come into season only once a year. 雌性巨蜥一年发一次情

Once and not so long ago
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Once and not so long ago 曾经在不久以前

She's not eaten once, in two months.
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She's not eaten once, in two months. 它已经有两个月没有吃东西了

Because it devotes so little energy to swimming, it only needs a meal once a month.
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Because it devotes so little energy to swimming, it only needs a meal once a month. 因为它游泳耗费的能量极少, 所以只需每个月吃1顿饭