系统已经做了几项改进。
Several improvements have been made to the system.
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been英 /biːn/|美 /bɪn/
made英 /meɪd/|美 /meɪd/
解释
have been made 是现在完成时的被动语态，由 have + been + 过去分词 made 构成，主语 improvements 是改进的结果、被做出来的，不是主动去做。强调修改已落实。
Several improvements have been made to the system.
have been made 是现在完成时的被动语态，由 have + been + 过去分词 made 构成，主语 improvements 是改进的结果、被做出来的，不是主动去做。强调修改已落实。