“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.
天宫一号，中国首个太空实验室，在今年4月2日完成任务后返回地球。
Tiangong Ⅰ, China's first space lab, returned to the earth after finishing its job on April 2 this year.
机器人完成任务后，可以在最短的时间内跟随鸽子返回。
After the robot finishes its tasks, it can follow the pigeon back in the shortest possible time.
应用推荐