作者pzubfwss ()
看板TOEIC
标题Re: [文法] to和of的不同??
时间Fri Aug 21 10:29:43 2009
※ 引述《yaerse (寂寞时就拥着书本吧)》之铭言：
: The duty cycle is the ratio of the on-time to the period;
: the modulating frequency is the inverse of the period.
: 这段是讲述PWM(pulse width module)的运作部分..
: duty cycle是指在一个周期中..电路为on的比例..
: =======================================以上是基本概念介绍
: 问题来了=================================================
: 第一句中..the ratio "of" the on-time "to" the period
: 第二句中..the inverse "of" the period
: 老实说已经有点搞不清楚啥时该用to..啥时该用of
: 就像很生活化的例子..
: the key to the door...
: the ticket to the concert..
: 有谁能帮我厘清一下阿...
: 小弟先谢过了..<(_ _)>
不知这样有帮助吗?
The duty cycle is
(the ratio
) of
("the on-time
" to
"the period
");
the modulating frequency is
(the inverse
) of
(the period
).
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