So, what you do is you set up a couple of displays, one where the block is stopped, the other one where you take this away with a trap door and it keeps going.
所以，你可以设计几个演示，一个是木块被挡住了，另一个是用活门把木块挪开，使得屏板继续上升。
2
Common trap factor calculation methods are suitable for anticlinal trap, but they are not applicable to complicated fault block traps.
以往所用的取值方法是沿用背斜圈闭的要素统计方法，不能适用于复杂的断块构造圈闭。
3
Little DAMS on farms, which block small streams or trap run-off from rain or flooding, are an even bigger worry.