落地：飞行员从机场塔台的进场管制员处得到落地许可，操作飞机降落在预订跑道上。
Landing: the pilot receives landing clearance from the Local Controller in the airport's control tower to landing on a designated runway.
依照有根据的理由或符合机械化的操作规则而进场，且直到趋势改变时才出场。
If you execute a trade, base it on a fundamental reason or technical rule, and then do not get out without a definite indication of a change in trend.
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