If urethral injury is suspected, urethral integrity should be confirmed by a retrograde urethrogram before the catheter is inserted.
如果怀疑有尿道损伤,前先性尿道造影以确定尿道的完整性。
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But for tall buildings its use has been limited by scepticism over its structural durability and its resistance to fire.
但对建筑,由对结构耐久性性的怀疑,它的使用受到了限制。
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