1. The whale calf swam alongside its mother, staying close for protection.
鲸鱼幼崽在母亲的身边游泳，为了保护而保持紧密的距离。
2. The researchers observed the behavior of a whale calf during their study on whale migration patterns.
研究人员在对鲸鱼迁徙模式进行研究时观察了一只鲸鱼幼崽的行为。