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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Single extrusion fragmented and opened cellulose structure, while twin extrusion destroyed and disrupted the cell wall structure of spent grain as well as reduced particle size.

单螺杆挤压撕开了纤维结构，而双螺杆破坏并摧毁了纤维细胞的细胞壁，同时麦糟的颗粒也变得很小。

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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