The first-stage vehicle is used to launch the rocket and is then jettisoned in the upper atmosphere.
第一级运载火箭是用来发射火箭的, 进入高层大气後即抛掉.
In Britain the upper Chamber is the House of Lords, and the lower the House of Commons.
英国上院即贵族院, 下院即众议院。
Tears are secreted by an organ under the upper eyelid.
眼泪由上眼睑下面的器官分泌。