T-21：try out 试用
A:Look! It's not working well, Did you try out the bike when you bought it?
A:看，这辆自行车不好用，你买的时候没试用吗？
B:No, there's no need. We can change it within two days if it's not damaged.
B：没有，也没必要。如果车有问题，没有被损坏的话，可以在两天内更换。
A:But it would save a lot of trouble if you had taken it for a test ride.
A:但如果你试骑一下的话，会省去许多麻烦的。
B:I know. I will pay attention to such a thing next time.
B：知道了，下次我会注意的。
