多数“新”抗菌素是老药剂的化学变种，因此，可能迅速出现耐药性。
Most "new" antimicrobials are chemical variants of older agents. Consequently resistance development can occur quickly.
在试管阶段进行的新抗菌素和疫苗的处理属于生物化学范畴，而当以低成本大批生产时，它就成为工程问题了。
The processing of the new antibiotics and vaccines in the test-tube stage belongs in the field biochemistry, but when great quantities must be produced at low east, it becomes an engineering problem.
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