我们所有的飞机都有适航证书。All our aircraft have certificates of airworthiness.适航审定主要包括型号合格审定和生产许可审定及其他工作.Airworthiness certification includes Type Certification and Production Certification , and other related work.经审查合格的,发给出口适航证书.A...
The aquifer which had once fed the wells was pronounced dry.曾为水井供水的蓄水层正式宣告干涸了。An aquifer is a water-bearing rock stratum such as sandstone and chalk.地下蓄水层是一些有水的岩石层, 如沙岩和白垩岩。Such material can confine water in an artesian ...