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。
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。
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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