他用这个节目的录像带教授英语。He uses tapes of this program to teach English.他甚至将记录他以前伟绩的录像带通通锁起来了。He had even locked away all the videos of his previous exploits.采用了演示及播放电影和录像带的形式，以起到教育作用。Demonstrations, films, and videotapes are show...
腮腺炎常引起血清淀粉酶增高.The blood amylase is usually elevated as a result of parotitis.淀粉酶 、 蛋白酶和其他不贵的大品种酶都是这样使用的.Amylase, proteases and other inexpensive bulk enzymes are used in this way.我们应确定糊精的值以便于存在时我们明确地评估淀粉酶的活性.Dextrin valu...