Aircraft can avoid each other by going up and down, as well as by altering course to left or right.飞机可以通过上下升降和左右移动改变航线来避免相撞。Aircraft can avoid each other by going up and down, as well as by altering course to left or rig...
The new airport is now fully operational .新机场现在可全面投入运营。Operational Research is a newly emerging subject.运筹学是一门新兴的学科.The airport did not become operational until May.机场到五月才可使用....
Whale-watching has become a growth leisure industry...观鲸业已经成为一个快速发展的休闲产业。Norwegian whalers said yesterday they had harpooned a female minke whale.挪威的捕鲸人说昨天他们用捕鲸叉捕获了一头雌性小须鲸。From the body, the sperm whale is smaller than t...