一旦你做了，还要当心接下来的下面几点。
Once you've done that, though, be aware of the following points going forward.
当心—最下面一级楼梯松了！
安静地听了一会儿这打开的通道口，确信这次下面不会有人突然出现，Simon当心地踏上梯子，向下爬去。
After a few moments of listening silently at the open hatchway, making sure that no one would surprise him this time, Simon stepped cautiously onto the ladder and began to climb down.
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