你应该保管好这份手册，这样随时想用都能马上在手边找到。You may want to keep this brochure safe, so you have it to hand whenever you may need it.我的书好像不在手边.I don't seem to have my book to hand.要经常把参考书摆在手边.Always have your reference books near at...
也许这些公司所激发的强烈的忠诚感只是一种有趣的癖好.Perhaps the intense loyalty that these firms inspire is just an interesting idiosyncrasy.1212光源 - 雷射原理, 自发与被激发的放光, 比例方程式, 输出功率.Sources - Laser principles, spontaneous and stimulated emission, ra...