膝盖也可能会失去机动性，如果弯的时间太长就可能无法伸直。俯卧也可以预防膝盖僵硬。
Knees too can lose flexibility and if bent for long periods can result in an inability to straighten fully. Prone lying will help to prevent this.
如果不能开车，就失去了机动性，从而失去大部分物资。
If we can't move our vehicles, we lose our mobility, and we lose most of our supplies.
如果不能开车，就失去了机动性，从而失去大部分物资。
If we can't move our vehicles, we lose our mobility, and we lose most of our supplies.
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