be used to do被用来做某事
例句：Zip codes are used to facilitate mail service.
邮政编码方便了邮递服务。
2. it's a pretty straight forward issue, a manufacturing issue, so it's been fixed upstream on any of the other airplanes we are building now.
fix on把…固定住
例句：The tail is fixed on the model plane with nails; it cannot come off.
模型飞机的机尾是用钉子钉在飞机上的, 不会掉下来。
3. And if they require any work, we can do it fairly quickly, so it really shouldn't have any effect on our produc
