frequency of occurences

• 出现频率

frequency of occurences的用法和样例：

例句

1. The abnormal colours of seedlings turned a low frequency.
   颜色异常的苗木出现频率较低。
2. The direction of the low frequency current with maximum frequency was also WSW.
   低频流出现频率最多的方向和潮流基本一致。