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。
When we are feeling vulnerable and low in confidence, it becomes very hard to trust our own judgement.
当我们感到脆弱和信心不足时，就很难去相信自己的判断。
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