combined vortex

• 复合涡旋

combined vortex的用法和样例：

例句

1. There are many vortex patterns on synoptic maps.
   摘要天气图上有许多种涡旋型式。
2. The pricipal objective in designing cyclones is to create a vortex.
   设计旋风除尘器的主要目的在于造成涡旋运动。