tricycle

1.When unemployed,I went to drive a tricycle.

我失业的时候就去拉三轮。

2.A little boy rode by on a tricycle.

一个小男孩骑着三轮过去。

3.Our son has just graduated from a tricycle to a proper bicycle.

我们的儿子刚刚从骑三轮过渡到骑普通自。

4.Another critical factor when designing tricycle gear is to properly balance the load carried by the main gear versus the nosewheel.

前三点起落架的另一个不利因素,设计时需要较精确的分配主轮与前轮的负荷.