"It might take the monarchs as many as four to five generations to complete the journey all the way back up to Canada," says Sarina Jepsen, who directs the endangered species program for the Xerces Society.
2
珍娜和杰夫完全知道该怎么做。
Jenna and Jeff knew exactly what to do.
3
珍娜叫杰夫把它清理干净，这样他们就可以继续煮剩下的粥了。
Jenna told Jeff to clean it up so they could continue to cook the rest of the porridge.
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