On the way out a boy of about ten came up on roller skates.
在出去的路上，一个大约十岁的男孩穿着旱冰鞋滑了过来。
Life has been in one way or the other a roller-coaster ride for everyone.
对于我们每个人，生命从一种方式或其他方面来说就像坐过山车。
A new drive way of roller chain is presented, which is rather similar to gear.
提出一种类似齿轮传动而非齿轮传动的新型滚子链传动方式。
A new drive way of roller chain is presented, which is rather similar to gear.
提出一种类似齿轮传动而非齿轮传动的新型滚子链传动方式。
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