The damage to structures with multiplepin-holes and cracks is a typical form of damage that exists in airplanes of old age and many other engineering structures.
If you have multiple tabs open, use a "Pin TAB" to make the tabs the size of the little icon on the left side.
如果你打开了多个标签页，使用“固定标签页”可使标签页在左侧缩为一个小图标。
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Locks in the series offer many kinds of keyless access control, including PIN, proximity, or dual-credential access with the option of single or multiple access codes.