他老是记不起把自己阅读时用的放大镜放在什么地方，所以助手们会随身携带备用的。He misplaces his reading glasses with such regularity that aides carry extras.他本该带上一把备用钥匙的。He could have taken a spare key.备用罐上写着“高度易燃”。"Highly inflammable," it says on the spare can...
In Europe, AC is usually generated at 50 Hz.欧洲的交流电输出频率通常为50赫兹。A measure of sound intensity equivalent to one decibel at 1000 Hz.一种声强的量度单位,其值等价于1000Hz1分贝.The frame rate is then 60 Hz.这时,帧速率为60赫....
长度: 8 - 0页,12级字型, 双倍行距, 用钉书机装钉并标示页码.Length: 8 - 10 typed pages , double - spaced in 12 - point type, stapled, with pages numbered.这种机器可以将纸牌装钉在袜子上.This kind of machine can staple paper brand - label on the socks.古铜色铝合金边框,...