Most bats navigate by echolocation.大多数蝙蝠靠回声定位来飞行。Most bats produce echolocation sounds by contracting their larynx.大多数蝙蝠通过收缩喉咙所发出的声音实现回声定位.Some bats have specialized structures for emitting echolocation calls.一些蝙蝠已经把用于发出...
贵公司的报价太高, 敝公司要求减价5%.Your price is too high. We ask for reduction of 5 %.敝公司可供一百吨钢材. 请速来订购.We can supply 100 tons of steel. Please order immediately.收到贵公司的定单后,敝公司将在两周内交货.We'll effect delivery within two weeks after r...