校对他们所写的东西并改正错误的英文

proofread their own writing and correct errors that they make

• 校对:    proofread; proof; ...
• 他们:    they
• 写:    write
• 的:    4次方是 The fourth po ...
• 东西:    thing
• 并:    combine; merge; in ...
• 改正:    correct; amend; pu ...
• 错误:    wrong; mistaken; i ...