Very young children should not be left to play without supervision.

不能让幼儿在没人照看的情况下独自玩耍。

It wouldn't be safe for him to be left to himself.

让他一个人呆着不安全。

Not a root or a branch will be left to them.

不根或部门将会离开。

It can be left to the default disabled state.

可以保留默认的关闭状态。

But the decision will be left to municipalities.

但是最后的决定权还要留给市政当局。