这一篇比那一篇稍难一点。
蝶泳腿非常重要，对一些人来说，俯蝶腿比仰蝶腿要稍难一些。
The fly kick is very important. And for some people it is a little more difficult on their stomach than on their back.
比起专注于不加筛选的去争取尽可能多的各类型客户来说，在某个特定小众领域里起步要稍难一些。
It can be a little harder to get started in a niche than just focusing on getting as many clients as possible of any kind.
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