second hand

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So how can cigarette smokers, or people exposed to second hand smoke, lower the risk of lung cancer?
因此如何使那些吸烟者，或是细二手烟的人们降低患肺癌的危险呢？
Otherwise they are just basing their opinions on second hand information and you in turn base your opinions on third hand information.
否则，他们仅仅第二手的材料依靠自己的观点，接着你将依据第三手的材料得出你的观点。
Anyway, we can’t stop trains to control those “second hand dealer”, if so, the price that pays for developing the national economy would be much higher than regulating these dealers.
那样的话，整个国民经济付出的代价要比治理“二道贩子”付出的代价要大得多。因此，必须要对代价进行衡量。

"We found that people with high exposure to second hand smoke had increased levels of depression and anxiety."
So you should have gotten two handouts as you came in, and if you didn't, please raise your hand and a TA will come to you and get you that second handout.
因此你们应该都在进来的时候拿到了两份讲义，如果你没有，请举手示意，助教会过去,给你第二份讲义。
麻省理工公开课 - 化学原理课程节选
He responds in the second paragraph of the letter in the left-hand column of the packet to this criticism that he's doing so little.
他在信左手边的第二段,对他做的如此至少的批评作出了回应。
耶鲁公开课 - 弥尔顿课程节选

The play was like a clock, every word spoken was another tick of the second hand.
NPR: Excerpt: 'Manhunt'

the long, thin part on some clocks and watches that shows how many seconds have passed

a pointer on the face of a timepiece that indicates the seconds &rarrcompare hour hand , minute hand