they use oxygen far more effectively than Maiacetus. 它们利用氧气的效率远高于慈母鲸
Effectively neuter me. 这就等于阉了我
both predator and prey are effectively blind, 猎食者和猎物都丧失了视力
In a matter of weeks, the continent effectively doubles in size. 几个星期之内, 整个南极大陆的面积将扩大为原来的两倍