necessary accessories中文什么意思

配套器材

• necessary:    adj. 必要的,不可缺的；必须的, ...
• accessory:    adj. 1.附属的，附带的，辅助的 ...
• be necessary to:    对…有必要

例句与用法

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1. The scheme embraces four projects , namely ( 1 ) to build up sluices at anqiu bridge and nanzhou bridge ( and the one at anqiu bridge is the first choice ) so that pollutants can be from entering the lake ; 2 ) as a necessary accessory for the above project , to supplement water capacity from changdang lake as a strategic water source into the protection program , and culvert - pipe plan is recommended from two other alternatives through systematic analysis ; 3 ) to carry out comprehensive realignment for some reed regions which are located at the entrances of the lake , and to develop a wetland ecosystem mainly with some reeds ; and 4 ) to set up a green protection belt right round the lake , including planting reeds at lakebeach , building forest belt , developing bases of green foodstuff and disposing sludges in the lake base
   该方案由4个工程子系统组成， ( 1 )截污工程：在岸丘桥和南州桥位置各筑一节制闸(而岸丘桥工程又是首选工程) ，以封住湖泊两头入流，杜绝污染物进入水源地的截污工程； ( 2 )引水工程：是截污工程的配套工程，利用下游长荡湖来补充水量，并对3个引水工程设想进行了系统分析，推荐涵管方案，同时将长荡湖作为该市战略水源地一并纳入保护体系中； ( 3 )湿地生态处理工程：对进入荡区前的芦苇区进行综合整治，发展以芦苇为主的湿地生态处理工程； ( 4 )环湖绿色自然保护带工程：包括建设围湖芦苇荡、环湖林带、绿色食品基地以及污泥处置。