Bloating burping and passing gas are natural and are usually caused by swallowed air or the breakdown of food through digestion .

腹胀、打嗝和排气是正常生理现象，通常因吞咽了气体或因食物经过消化道时分解所致。

Welsh farmers will be asked to try out new diets on their livestock to cut the amount of methane their burping releases into the atmosphere .

英国威尔士地区将要求农民尝试给牲口喂食新“配方”饲料，从而减少它们打嗝时释放到大气中的甲烷。

I spent several years trying to separate out people with helicobacter from people who don 't have it on the basis of things like , do they feel nauseated , are they burping , do they have bad breath or headaches-all those kind of vague systems .

我花了几年的时间试图将幽门螺杆菌携带者和非携带者区别开来，基于一些问题如，你是否感到恶心，是否打嗝，是否有口臭或者头痛这些研究系统都很模糊。