Forms of gastroenteritis include food poisoning, cholera, and traveler's diarrhea.胃肠炎的病因还有食物中毒 、 霍乱和旅行者腹泻.An inoculation against cholera is recommended.建议注射预防霍乱的疫苗。They feared a new cholera pandemic...他们担心新一轮的霍乱大流行。...
Imposing speed restrictions is easy, but forcing motorists to observe them is trickier.限制车速容易，但强制司机遵守这些限速规定就难办多了。Imposing speed restrictions is easy, but forcing motorists to observe them is trickier...限制车速容易，但强制司机遵守这些限速...