这里凉快坐下来歇会儿: it's nice and cool here. let's sit down and have a rest. cool oneself
游了半天了快上来歇会儿吧: you've been swimming a long time now. come out and have a rest
他从早到晚忙来忙去从不歇会儿: he's at it from morning till night and never gives himself a rest
替: Ⅰ动词1.(代替) replace; substitute for; supply [take] the place of 短语和例子接替 replace; take over; 用塑料来代替木材或金属 use plastics in place of wood or metal; 你歇会儿, 我来替你。 have a rest. i'll take over. 谁来替她呢