identical twin
US /aɪˌden.tɪ.kəl ˈtwɪn/
UK /aɪˌden.tɪ.kəl ˈtwɪn/

1.
同卵双胞胎
either of two fetuses or children born at the same birth who have developed from the same ovum and are therefore always of the same sex and usually very similar in appearance
:
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My cousins are identical twins; it's hard to tell them apart.
我的表兄弟是同卵双胞胎;很难分辨他们。
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She gave birth to a pair of healthy identical twins.
她生了一对健康的同卵双胞胎。