Setting speed-limit standards is a complex technical subject, because of many speed factors.

影响速度的因素有很多，因此制定限速标准是一项复杂的技术工作。

youdao

Setting speed-limit standards is a complex technical subject, because of many speed factors.

影响速度的因素有很多，因此制定限速标准是一项复杂的技术工作。

youdao