“在它们后面游”这个说法的意思是跟在别人的后面游泳。在英文中，这个意思可以用一个短语表达："swim behind someone/something"。这个短语是由两个单词组成的："swim"和"behind"。"Swim"是一个动词，意思是游泳。"Behind"是一个介词，意思是在某物后面。
下面是几个使用了"swim behind someone/something"短语的例句，以及它们的中文翻译：
"I pke to swim behind the boat because it's easier than swimming on my own."
我喜欢在船后面游泳，因为这比自己游要容易。
"The children all wanted to swim behind the dolphin, but the trainer said it was too dangerous."
孩子们都想在海豚后面游泳，但训练员说这太危险了。
"The dog loved to swim behind its owner when they went to the beach."
这只狗喜欢在主人去海滩的时候在他后面游泳。
下面是几个使用了"swim behind someone/something"短语的例句，以及它们的中文翻译：
"I pke to swim behind the boat because it's easier than swimming on my own."
我喜欢在船后面游泳，因为这比自己游要容易。
"The children all wanted to swim behind the dolphin, but the trainer said it was too dangerous."
孩子们都想在海豚后面游泳，但训练员说这太危险了。
"The dog loved to swim behind its owner when they went to the beach."
这只狗喜欢在主人去海滩的时候在他后面游泳。