昏昏头了
Tom has worked for A company and after then he worked for B company . 英语中没有先后这种说法
大眼睛鱼儿
先后的翻译一般用 respectively 分别怎样 来代替，并置于句末，引导两个并列句。Worked in Maintenance Department as the Customer Services Supervisor and Contractual Project Engineering Department as the System Engineer respectively.
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