The pilot held a current airline transport pilots licence (helicopters and gyroplanes) and a valid class one medical certificate. He had 3, 900 hours of operating experience.

肇事直升机的飞行员具备有效的航空运输飞行员执照(直升机和自转旋翼机)和一级体检合格证明书，并拥有3,900小时的飞行经验。

youdao

The pilot held a current airline transport pilots licence ( helicopters and gyroplanes ) and a valid class one medical certificate. he had 3, 900 hours of operating experience.

肇事直升机的飞行员具备有效的航空运输飞行员执照（直升机和自转旋翼机）和一级体检合格证明书，并拥有3 ， 900小时的飞行经验。

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During normal operating hours of a system, this can have considerable performance implications and slows down the response time of the system.

在系统正常操作时间段，这会显著影响性能，降低系统的响应速度。

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Or suffer a heart attack and be on the operating table for some number of hours and then, thanks to cardiac surgery or what have you,be resuscitated.

或是心脏病发，在手术室里经历数小时，最终被心脏外科医生救回来。

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