导致黑人个体易感高血压及钠排泄能力的减低的机制还不十分清楚。

The mechanisms that account for the susceptibility of black individuals to hypertension and their reduced ability to excrete sodium are poorly understood.

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椎管内麻醉病人应证明有排泄能力，这是骶部交感神经消失的证据。

Following administration of an epidural or spinal anesthetic, the patient should demonstrate the ability to void. This provides evidence that residual sympathetic blockade has dissipated.

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太长的长度，超过9.14米，或者采用的弯头数量超过4个，对于安全阀的排泄能力都可能造成阻碍。

Excessive length, over 30' (9.14m), or use of more than four elbows can cause a restriction and reduce the discharge capacity of the valve.

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