b back and forth
B来回
以上为机器翻译结果，长、整句建议使用 人工翻译 。
B. People were running back and forth. Obviously, something unusual had happened.
人们跑来跑去，显然发生了不寻常的事情。
youdao
应用推荐
模块上移
模块下移
不移动