该交响曲结束部分各节中的弦乐全为弱化音.The strings are muted throughout the closing bars of the symphony.随着年龄的增长，人体体温调节机制的功能往往会有所弱化。As we get older the temperature-regulating mechanisms in the body tend to become a little less efficient.将他...
Twelve potential vaccines are currently being tested on human volunteers.目前正在人类志愿者身上试验12种试用疫苗。Anti-malarial vaccines are now under-going trials.抗疟疾的疫苗正在试验阶段。His team are at the forefront of scientific research into vacci...