We have just done our first underwaterrepair, having found a piece of timber had broken.
我们刚完成了第一次水下维修，发现有一个水管已经破裂了。
2
For restrained by project location and environment condition, impervious treatment can not be performed in the dry, underwaterrepair is also difficult.
由于受其地理位置和环境条件制约，无法实现干地施工，水下维修也有相当大的难度。
3
Testing results showed that the grouting material modified by vinyl ester resin as underwaterrepair material, at optimum content, was of good bonding strength.