When is a single-injection nerve block not really a single injection?

单次注射神经阻滞什么时候不只是一次简单的注射呢？

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Yaws can be treated with a single dose of a cheap and effective antibiotic: Benzathine Penicillin injection cures the disease.

治疗雅司病只需要一剂便宜且有效的抗菌素-注射苄星青霉素可以治愈该疾病。

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A single intramuscular injection of Benzathine Penicillin is curative.

肌内注射一剂苄星青霉素即有疗效。

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In a small but groundbreaking study published in 2006 in the Archives of General Psychiatry, 17 people with major depression who had failed to get adequate relief from at least two other antidepressants were given a single injection of ketamine.

WSJ: Drugs to Relieve Depression in Hours Not Weeks