... epigastric flatulence 支膈 expel flatulence 下气 flatulence factor 胃肠胀气因子; 胀气因子 ...
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expel flatulence
驱逐肠胃气胀
以上为机器翻译结果，长、整句建议使用 人工翻译 。
And of course, there is cow flatulence: as cattle digest grass or grain, they produce methane gas, of which they expel up to 200 L a day.
当然还有牛的肠胃气涨：当牛消化草或谷物时，每天产生超过200升的甲烷气体。
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