几何看来有时候要领先于分析，但事实上，几何的先行于分析，只不过像一个仆人走在主人的前面一样，是为主人开路的。

James Joseph Sylvester Geometry may sometimes appear to take the lead over analysis but in fact precedes it only as a servant goes before the master to clear the path and light him on his way.

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其中26例颅内转移症状先于肺部原发症状，称之为脑先行型。

In 26 of 45 case, the symptoms resulted from intracerebral lesion appeared earlier than those of lung.

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