Mobility system: no deformation of four limbs, no red swelling of joint. Free movement.
运动系统；四肢正畸形，关节无红肿，活动自如。
No swelling of joint. Movement not restricted. No swelling of both legs. No venous hemangiectasis.
关节无肿胀，活动不受限，双下肢无浮肿、无静脉血管扩张。
If there is significant swelling within a joint, you will lose range of motion — the limb will only go so far in each direction.
如果关节存在严重的肿胀，就会无法活动——肢体在每个方向上的活动范围都十分有限。
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