键控插入;
The ATX power connector is keyed for proper insertion. If we had used our right hand we would not have been able to point the middle finger in the correct direction.
ATX电源线具有方向性,如此可避免使用者有插错方向之虞。如果我们使用自己的右手,我们将无法用中指朝向正确的方向。
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