For mammals like ourselves, this must cover the increased costs that mothers incur during pregnancy and lactation.

像我们这种哺乳类，生产能量还包括母亲在怀孕、哺乳期间增加的能量开支。

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For mammals like ourselves, this must cover the increased costs that mothers incur during pregnancy and lactation.

像我们这种哺乳类，生产能量还包括母亲在怀孕、哺乳期间增加的能量开支。

youdao