英语翻译结构：which引导一个定语从句对上句情况的进一步说明.1.我们常常看到有人乱丢乱吐,这弄得我们的环境很脏.2.

1. We often see people littering or spitting, which made of our environment is very dirty.
2. Her parents are very grateful to us, the doctor also highly evaluation of our first aid, which makes us aware of the necessity of learning first aid.