为安全起见

To be safe you should go up a ladder one rung at a time.

为起, 登梯子时你应该一步一步往上爬。

I’ve put new locks on all the doors, and just for good measure, I’ve put locks on all the downstairs windows too.

我已经在所有门上了新锁，为起，楼所有的窗子也加了锁。