Rear Ball Diff 后方球差异
As in all standing poses, both of your feet should bear equal weight on the front of the heel and the rear of the ball of the foot.
在所有的站姿，双脚应该均匀地承担重量，重量在脚跟的前面和脚球的后面。
The rear of the bike is equipped with a ball joint so that it can move freely following the leaning of the front part.
后面的车配备了球窝接头，以便它能够自由流动的倾向后，前面的一部分。
Permanently sealed and lubricated ball bearings front and rear.
前后端盖装有永久密封和自润滑的滚珠轴承。
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