... hard point 承力点；加固点 hard time maintenance定时维修 hard time limit 定时检修极限 ...
双语例句
1
Li Xianyong normal every day maintenance tasks in the same time, played hard at studying infrared protection.
李宪永在每天完成正常检修任务的同时，埋头钻研起了红外线保护装置。
2
An engine at idle for extensive periods of time could dramatically shorten the life of your plugs, causing you to spend hard-earned money on unnecessary service and maintenance.