Man is not a circle with a single centre; he is an ellipse with a double focus.

人并不是只有一个圆心的圆圈；他是一个有两个焦点的椭圆。

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Methods. Single-centre, randomized, prospective, double-blinded comparison of bosentan and placebo.

方法：单中心，随机，前瞻性，双盲比较波生坦和安慰剂。

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France is meant to be at the centre of a single market that depends on the freedom of movement of goods and people.

ECONOMIST: The French way | The

Fears that the next election might have a similar outcome led Preston Manning, Reform's leader, to launch a crusade aimed at creating a single right-of-centre party at the federal level, to be called the United Alternative.

ECONOMIST: Canada��s right

Its 24 hour call centre is the biggest single employer in Leeds.

BBC: Cloth caps to cyberspace