Changes in the input voltage lower the barrier and increase current flow in transistors, just as adding an enzyme to a chemical reaction speeds it up.
改变输入电压能降低屏障并增加晶体管电流，正如加入酶使化学反应加速一样。
2
Dr Renslo and his colleagues have therefore been analysing and modifying the chemical structure of aminothiazoles to see if this can enable them to cross the blood-brain barrier.
为此，Renslo博士与其同事已经在分析并尝试修饰氨噻唑的分子结构，以使之能通过血脑屏障。
3
The functions of the secretory barrier of the tracheobronchial tree are physical, chemical, immunological , and biological.