suffer与suffer from的差异
suffer 饱尝，使遭受（坏事，不愉快的事），其宾语一般是loss, pain, punishment, defeat, wrong, hardship, torture, grief, injustice, discouragement, disappointment等。
I will not suffer such conduct. 我不能容忍这种行为。
They suffered huge losses in the financial crisis. 他们在经济危机时遭受了巨大损失。
suffer from 因……而苦楚
1. suffer from+疾病名词（或许别人闲言碎语、劳累、回忆力减退等），表明患病、为……遭受痛苦。
She suffers from headache. 她患头痛病。
I'm suffering from a lack of time this week.我为这周时刻不够用而苦。
2. suffer from+自然灾害
suffer from drought 遭受旱灾；suffer from floods 遭受水灾
注：有时二者差异不大，可换用。
suffer hunger 挨饿； suffer from cold and hunger啼饥号寒
