come upon和suffering from的意思及用法

come upon
1。偶遇
Jessica came upon some old letters when she was cleaning the room。
杰西卡在清洁房间的时候偶遇了一些旧信件。
I chanced upon an old schoolmate in the street yesterday。
昨天我在大街上偶遇了我的老同学。
2。突袭
We decided to swoop down upon the enemy there。
我们决定突袭驻在那里的敌人。
That day Shvabrin swooped down upon them with his troops。
那天希瓦卜林带领人向他们发动突袭。
3。突然产生
Fear came upon her as she walked along the empty street。
她走在空荡荡的街上,突然产生一种恐惧。
suffer from
1。遭受
The crops suffered from frequent blights。农作物经常遭受病虫害。
She is suffering from unspeakable pain。她在遭受难以形容的痛苦。
2。因 。。。而蒙受损害