对于超声不能明确诊断的孩子，可选择观察和重复超声波检查或CT扫描，当然这两者都有一定的风险。

In the child with a nondiagnostic ultrasound, options include observation and repeat ultrasound scan or CT scan, both of which have associated risks.

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驾车时，每5 - 10钞检查一遍后视镜。交通拥堵或路上车辆以不同速度行驶时，更要留意观察后视镜。

While driving along, check your mirrors every 5 to 10 seconds. Check your mirrors more often in heavy traffic or where vehicles are moving at different speeds.

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在安装之前，应该对所有连接部件进行检查，看是否存在阻断、碎屑、刨削屑或其他可观察到的损坏情况。

All joint components should be inspected for any breaking, chipping, gouging or other visible damage before proceeding.

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