Starley of England devised the more modern bike with a chain and gearing to allow the wheels to be of equal size.
使用滚珠轴承及链条设计出了前、后车轮大小一样的现代自行车。
If it is to travel in a straight line, the wheels on both sides have to be of exactly equal size.
那么,你就会知道小汽车几乎很少顺着直线跑,那么它左右两边的车轮的大小必须是正好绝对相等的。
These sizes must obey the rule that twice the size specified must be less than or equal to the dimension of the image in that direction.
这些尺寸的大小必须满足这样一个规则,尺寸的二倍必须小于或等于在那个方向上图像的尺寸大小。
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