“我们试着睡一会好节省体力，”她说道。
"Let's try to get some sleep and save our energy," she said.
为了节省体力，鸟儿们更喜欢顺风，它们期待着天气转好。
To conserve energy, migratory birds prefer tailwinds, and are willing to wait for good weather.
便携钻机或是电动链锯能够节省体力，并使大块木板的粗加工化繁为简。
A portable drill or an electric chainsaw could save Labour, and make light of roughing out big boards.
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