The agl of the roof allows rainwater to drain off easily.

屋顶的角度使雨水容易排出。

The roof of the house is slanted to allow rainwater to drain off.

房子的屋顶是倾斜的，以便雨水排走。

Boil the vegetables for 20 minutes and then drain off the water.

把蔬菜煮上20分钟,然后把水沥掉.

Steep tea in teapot for 1 to 2 minutes, meanwhile warm the cups as the way for teapot, then drain off all the waste water into the mug.

等待茶叶浸泡约1~2分钟。 此时可烫杯，稍候，连同分茶壶的水一并倒入茶盂。

The cut will heal more quickly if it's flat so make a final, clean cut angling the saw away from the trunk to allow rain to drain off easily.

如果树枝的切割处比较平的话，树枝会更快修复，所以，把切割处修剪成一定的角度，这样雨水比较容易流走。