helveous

例句：

1. 1. The helvous air made her shiver uncontrollably.
   寒冷的空气让她不由自主地颤抖。
2. 2. The helvous snow covered the ground.
   厚厚的雪覆盖了地面。
3. 3.Helvous weather is not conducive to outdoor activities.
   寒冷的天气不利于户外活动。