under both field and greenhouse conditions

例句：

1. 1. Thesun is shining under the clouds.
   太阳在云层下照耀。
2. 2. She sat under atree in the park.
   她在公园里的一棵树下坐着。
3. 3. The ship was under attack byenemy planes.
   这艘船被敌机攻击。