back wall的用法和样例：
例句
- We presented a 46 years old woman with posterior wall RVF after the rectal cancer surgery.
我们在此提出一位四十六岁女性，在经过直肠癌手术之后，发现有直肠阴道后壁瘘管。 - The persistent left superior vena cava will drain either in the back of the left atrium or in the coronary sinus.
永存左位上腔静脉引流左房后壁或者冠状窦的血液。
词汇搭配
- have one's back to the wall 处境困难
- fight with one's back to the wall 拼死斗争
- have one's back at the wall 被逼到没退路,负隅死...
- back to the wall 落入圈套
- with one's back to the wall 困兽犹斗地
