There are two kinds of twins in Berlinite: electric twin and optical twin.

磷酸铝晶体中存在两类双晶：电双晶和光双晶。

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It's nearly 20% more likely to sell than its noncharity twin and at a price that's about 2% higher.

比起没有标注慈善捐助的销售方式来，即使价格高出2%，被购买的几率仍然高出 20%。

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The hotel features both twin and double bedrooms, which are booked on a first-come, first-served basis.

两个单人床的双人标间和一个双人床的双人卧室。

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The story is told by Sara Louise Bradshaw, a 13-year-old girl who lives with her parents and her twin sister Caroline.

VOA: special.2009.02.14

And he said, "Too bad you don't have a twin."

比尔说：“你没有双胞胎兄弟真是太没劲了“

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

The Minnesota Twin study, one of the most famous studies in the field of psychology, was done by Lykken and Tellegen,two prominent psychologists.

明尼苏达州的双胞胎研究，一个在心理学领域非常有名的研究，是两个杰出的心理学家Lykken和Tellegen做的。

哈佛公开课 - 幸福课课程节选

James McKinney, is McKinney's identical twin and is based at the Army's Training and Doctrine Command at Fort Monroe, Virginia.

CNN: Army removes McKinney from top post

The Harry Hill Movie will also star Matt Lucas as the TV Burp star's twin and Julie Walters as his petrol-drinking grandmother.

BBC: Harry Hill

If you are an identical twin and your twin has bipolar disorder you have a 50 percent chance of having or getting it yourself.

CNN: What are the chances my future kids will be bipolar?