heavy swell

1. The heavy swell made things difficult for the boats.
   汹涌的浪潮使船只陷入险境。
2. There's a very heavy swell today, so we're not going sailing.
   今天有很大的浪涛，所以我们不航行了。
3. The monsoon in winter is stronger than that in summer, and correspondingly, the average wave high is higher, and the frequencies of rough sea and heavy swell are also stronger.
   冬季季风比夏季季风强盛，相应的平均波高、大浪大涌频率也较大。

noun

1. a broad and deep undulation of the ocean

   Synonym:    ground swell