spot audit的用法和样例：
例句
- A spot check showed that at least five percent of the oranges were contaminated.
一项抽查显示那些柳橙至少有百分之五受到了污染。 - Shenzhen-made Nokia mobile phone batteries were found defective during a recent spot quality check of mobile phone batteries nationwide by the nation's quality watchdog.
近日，在国家质检总局发布的全国手机电池抽查结果中，深圳产诺基亚电池上了不合格黑榜。
