目的评价超声心动图对室间隔缺损定位诊断和缺口大小定量诊断的准确性。
Objective To evaluate the accuracy of echocardiography in assessment of the location and size of ventricular septal defect.
识别经济泡沫开始形成当然有难度，但央行已经有过处理其他不可预知事件的经验，像衡量产出缺口的大小或结构性失业率的水平。
It is certainly hard to spot bubbles; but central Banks already grapple with other imponderables, such as the size of the output gap or the level of structural unemployment.
本月早前，在将覆盖着上半规管的引脚大小的骨头缺口填补的手术成功之后，他重新回到了工作岗位。
He returned to work earlier this month after successful surgery to plug a pin-size hole in the bone covering the semicircular superior canal in one of his ears.
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