I was important to them, and I couldn't let them down.
我对他们太重要了,我不能就这么抛弃他们。
I don't want to let them down.
我不想让他们失望。
I feel obliged not to let them down.
我觉得我不能让他们失望。
Also all my fault because I should not have let them down.
同时也都是我的错,因为我不该让他们失望。
I would definitely follow my teachers' advice and not let them down.
以后我一定会听老师的话,不会辜负老师的期许。
I would definitely follow my teachers' advice and not let them down.
以后我一定会听老师的话,不会辜负老师的期许。
应用推荐