nec·es·sar·y

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【释义】：

a．❶ 必要的，必需的：Air is necessary to life．空气是生命所不可少的．It is necessary to have faith in the masses and rely on them．必须相信群众，依靠群众．It is absolutely necessary that one should observe discipline．遵守纪律是绝对必要的．❷ 必然的，必定的：a necessary result必然的结果．a necessary evil难免的灾祸．

－n．(常pl．)(生活)必需品：the necessaries of life生活必需品．