ad·di·tion

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【词性】：n．

【释义】：

❶ 【数】加法：The sign‘+’stands for addition．‘+’号代表加．in addition 另外，还有．in addition to加之，除…外，又：In addition to the work in the fields，she takes up medical service of the brigade．除去田间劳动，她还担任生产队的医疗工作．❷ 增加物：Comrade Lu will be a useful addition to the staff of the school．卢同志会成为一个不错的新教师．❸ 杂质．❹ 连接．❺ 【化】加成．