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他们就是西山背后的印第安人，一谈到这个题目他就滔滔不绝说个没完。
For it was his contention that they were the Indians beyond the Western Mountains, and on this subject he would talk endlessly.
youdao
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他一开口就滔滔不绝。
When he started to speak, the words just spilled out.
《牛津词典》
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他一开口就滔滔不绝。
When he started to speak, the words just spilled out.
《牛津词典》