primary cyclone

例句：

1. 1. The primary cyclone is expected tohit the coast within the next few days.
   预计主要气旋将在几天内袭击海岸。
2. 2. The primary cyclone has caused significantdamage to the coastal area.
   主要气旋已对沿海地区造成了重大损害。
3. 3. The primarycyclone was responsible for the flooding inthe affected area.
   主要气旋是导致受影响地区洪水的原因。