Consequently the bedding and backfilling of the trench need special attention to provide the required lateral support.
其后，管道沟的垫土和回填需要特别注意，应提供所需要的水平支撑。
2
Ensure there has enough operation space, and make support if the trench is not firmly.
保证有足够的操作空间，如果管沟不够坚固，要有足够的支撑。
3
The trench is etched in the support substrate exposing the intermediate insulator, which is then etched to form a gap between the mass body and flexible beam cross.