“完成返回加拿大的整段旅程，帝王蝶可能会经历四到五代。”薛西斯戈灰蝶协会濒危物种项目的负责人萨琳娜·杰普森说道。

"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.

youdao

珍娜和杰夫完全知道该怎么做。

Jenna and Jeff knew exactly what to do.

youdao

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.

youdao