I backed up carefully until I felt the wall against my back.
我小心翼翼地后退了几步，直到感觉到后背贴上了墙。
This often happens inadvertently when your back is up against a wall.
这一点常发生在我们面临巨大困难的时候。
If you have difficulty sitting like this, prop up your back against a wall.
如果这么坐着有困难，就背靠墙坐吧。
"And, you, back up against the wall," he said to the man behind the counter.
“你，往后退，靠在墙上，”他对餐台后面那个人说道。
All of you, stick 'em up and get back against that wall.
统统都把手举起来，退过去靠着那面墙。
All of you, stick 'em up and get back against that wall.
统统都把手举起来，退过去靠着那面墙。
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