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一听到笑话，他们就大笑起来。
On hearing the joke, they began to laugh loudly.
youdao
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他们一明白那个笑话，就哈哈大笑起来。
Once they understood the joke, they broke out into laughter.
youdao
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说完，他们就哈哈大笑起来。
Say that finish, they burst out laughing.
youdao
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说完，他们就哈哈大笑起来。
Say that finish, they burst out laughing.
youdao