Size differences between twins can sometimes be caused by a condition called Twin to Twin transfusion syndrome.

“双胞胎输血综合症”有时候会引起双胞胎之间的大小差异。

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Eight-year-old Helen, her nine-year-old twin sisters, Anabel and Eliza, and her two-year-old brother, Angus, had gotten nearly life-size stuffed animals for Christmas.

八岁的海伦，她九岁的孪生姐妹安娜贝尔和伊莱扎以及她两岁的弟弟安格斯都得到了几乎和实物一样大的圣诞填充动物玩具。

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This cannot be the actual size of the dark object, the Dark Twin. The Zetas explain.

这不可能是该黑暗物体，即黑暗孪星的实际大小。

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The twin landers, each the size of a desk and weighing 375 pounds (170 kilograms), will ramble dozens of meters a day, drilling into rocks and scooping up soil in preliminary field studies to help identify ancient oases.

CNN: Race to Mars begins a distant search for life

Venus is a twin to the Earth in terms of size and mass, yet has evolved in a very different direction, with a surface temperature hotter than a kitchen oven and a choking mixture of noxious gases for an atmosphere.

BBC: Venus mission is on

Mourners streamed into the newly opened memorial, which has two reflecting pools, each almost an acre in size, in the footprints of the twin towers.

BBC: 9/11 anniversary: Sombre US honours victims 10 years on