单词意思：
negative effect
单词例句：
The crisis had a negative effect on trade、
这次危机对贸易产生了很坏的影响。
Sleeping on your left side may have a negative effect on sympathetic nervous activity、
向左侧睡可能会对交感神经活动产生负面影响。
An important negative effect of gossip is that it can hurt the person being talked about、
八卦的一个重要的负面影响是，它会伤害被谈论的人。
Nowadays, many students are suffering from tremendous stress which has a negative effect on both their physical and mental health、
如今，许多学生都经受着巨大的压力，这对他们的身心健康有着消极的影响。
The negative effect is basically twofold、
这种负面影响基本上是双重的。