1. 第一千：thousands 数千 | thousandth 第一千 | Thrace 色雷斯
2. 千分比：Thickness 厚度 t | Thousandth 千分比 ‰ | Ton 公吨 T
3. 千分之一的：path 小道;小径 | thousandth 千分之一的 | wavelength 波长
4. 第一千,千分之一：thorough walk-around inspection;围绕机器的全面检查 | thousandth;第一千,千分之一 | thrd;螺纹
1. 第一千
The thousandth item in a series is the one that you count as number one thousand.
e.g. The magazine has just published its six thousandth edition.
这本杂志刚刚出版了第 6,000 期。
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2. 千分之一
A thousandth is one of a thousand equal parts of something.
e.g. ...a dust particle weighing only a thousandth of a gram.
重量仅有千分之一克的灰尘微粒
1. All events in luge are timed to the thousandth of a second.
2. But the programme's budget is less than one thousandth of the 200 million dollars that the US corporation is prepared to spend.
noun
1. one part in a thousand equal parts
Synonym: one-thousandth
2. position 1,000 in a countable series of things
adj