最佳答案：spend at释义：花在例句：I spend at least six hours a week marking.我每周至少要花六个小时批改作业。A quarter of all sea speci
spend at释义：
花在
例句：
I spend at least six hours a week marking.
我每周至少要花六个小时批改作业。
A quarter of all sea species spend at least a part of their life in a reef and many reefs are in cold or temperate waters.
四分之一的海洋物种在珊瑚礁中度过了它们一生中至少一半的时间，而且很多珊瑚礁处于寒冷或温和的水中。
