美联储建立于1911年，在此之前，在美国进行了央行体系的零星试验。
The Federal Reserve dates only from 1911, and before then experiments with central banking in the United States had been sporadic.
要得到一个整洁的五角星可能需要一些试验，这取决于鞋子宽度和鞋孔大小。
It may take some experimentation to produce a pentagram with fairly even points, which will depend on the width of the shoe and the eyelet spacing.
Schwartz说，在该四面楚歌计划中的“四星”自信已经被强化，因为该飞机今年的飞行试验计划已经大大提前。
The four-star's confidence in the embattled program has been boosted because the plane is considerably ahead of its flight test schedule for this year.
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