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.
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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