They have imposed a ban on the import of seal skins.他们已经禁止进口海豹皮。The government imposed a ban on the sale of ivory.政府禁止出售象牙。The government has imposed a ban on the sale of handguns.政府已下令禁止销售手枪。The city has imposed a ban on smoking in all restaurants.该市已颁布了在所有餐馆适用的禁烟令。