易混淆的单词： SineSINE

An interest in children is a sine qua non of teaching .

对儿童关心的是当教师的必要前提。

Just as corn and soy are the bread and butter of big ag , the persistence of small , traditionally conceptualized farms practicing time honored agricultural techniques is the sine qua non of the sustainable food movement .

玉米和大豆是养猪业的命脉，同样，那些采用老旧农业技术的小型、传统和概念型农场的存在，也是可持续食物运动的必要条件。

The meeting will adjourn sine die .

这个会议将会无限期休会。

Gradually , the separate sine waves have become visible .

逐渐地，“正弦波”曲线出现明显的分离。

Neuroscientists have shown over and over that attention is the sine qua non of learning and thus of boosting intelligence .

神经学家已经一再强调，良好的注意力是学习能力出类拔萃的基石，其对智商的重要性也可想而知。