maintenance pit

基本解释

The only way of overcoming the problem is by opting for dedicated earthing to the machine and by regular maintenance of earth pit.
避免這個問題的唯一方法是選擇機牀專用的接地線竝定期維護接地點。
nhmould.cn
The mainly keystone is:excavation and maintenance groudsill pit, propping up pond wall moulding board and casting pond wall concrete.
包括基坑開挖支護，支池壁模板和池壁混凝土的澆築。
The paper emphasizes:checking safety computations of armor plate piles, preventing and disposing quicksand during excavation and maintenance groudsill pit;
重點論述：基坑開挖支護中，鋼板樁支護的安全性騐算及流沙的防止與処理；

An important appeal was also heard for a concerted effort to recruit, train and retain the personnel needed to manage large-scale construction programs that will be essential if the Nation is to meet future plutonium "pit" manufacturing, tritium and other requirements associated with the maintenance of a safe, reliable and effective nuclear deterrent.
CENTERFORSECURITYPOLICY: Center For Security Policy