the reason for的意思是什么

造句：

1.At present, it is impossible to estimate the damage caused by the fire, the cause of which is still under investigation.

目前,暂时无法估计这场大火对他们所造成的损失,起火原因仍在调查中。

2.The climate is very different at the same latitude because of ocean currents.

由于洋流的原因，同一纬度的气候非常不同。