踹门足迹是指犯罪嫌疑人用足撞击门，破坏锁体或门，使门锁分离或门板与门框分离而遗留在门面上的足迹。

Tracks of kicking doors are marks produced in the surface of the door by suspects who kick doors by feet to destroy the lock or door to tear them or split the door from the frame.

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要通过分离锁来修复内核恐怕不太容易。

Fixing the kernel by breaking up the lock is not easy.

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四元数就不会遭受万向节锁的痛苦，因为它不用三个分离的轴表示旋转。

Quaternions do not suffer from gimbal lock, because they do not express rotations relative to three separate axes.

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