vortex lentis

例句：

1. 1. The vortex of the tornado was visible from miles away.
   龙卷风的涡流从几英里外就能看到。
2. 2. The scientist observed the vortex and recorded its behavior.
   科学家观察了涡流并记录了它的行为。
3. 3.The vortex is a dangerous phenomenon that can cause severe damage.
   涡流是一种危险的自然现象，可能导致严重破坏。