I found Thread-sail filefish, about 10 cm long. It swam quickly, stopped suddenly and started swimming slowly again. It can swim very well because the fins work in high speed finely.
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it swam quickly
它游得很快
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It swam quickly, stopped suddenly and started swimming slowly again.
它游的很快，突然停下来并开始游的很慢。
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