Do spend money on a good lock, because the cheap ones can be very very easy to cut.

一定要花钱买一把好锁，因为便宜的很容易被弄断。

Second, make sure you buy a good lock. It can be expensive, but it's never a waste of money.

第二，确保你买了一把好锁。它或许很贵，但绝不是浪费钱。

Second, make sure you buy a good lock.

其次，一定要买一把好锁。