Midway up the door was fixed a plate of metal: Simon could not tell if it was a latch or a peephole cover.
这门的中间，固定着一个金属板：Simon不知道它是个插销，还是窥视孔的盖子。
The value of width can be acquired ingeniously by using duplex latch mode while there is a hole defect in the steel plate.
用两次锁存法可巧妙地提取有孔洞缺陷时的板宽值。
The value of width can be acquired ingeniously by using duplex latch mode while there is a hole defect in the steel plate.
用两次锁存法可巧妙地提取有孔洞缺陷时的板宽值。
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