back

/bæk/

副词

在原处；回到原处；恢复原状；返回；回到以前
He looked back and saw they were following him.
他向后看了看，发现他们正跟着他。
向后；远离
"Keep back!" he shouted, "Don't come any closer!"
“退后！”他大叫着，“不要再靠近了！”