Smoking is an addictive habit which is very hard to let go. The nicotine present in the tobacco causes emotional and physical dependence.

吸烟会上瘾并且很难戒掉，烟草内的尼古丁会使人产生心理依赖和物理依赖。

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PE is the enzyme responsible for the hydrolysis of pectin present in orange juice, which causes the loss of fresh juice cloudiness and influences the colour and sweetness of the juice.

PE会引起果胶的水解，使新鲜果汁特有的浑浊状态丧失，影响柑橘果汁的色泽、美味。

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At present, many enterprises in our country have the insufficiency in the operational site arrangement, which causes the enterprise worker to be easy fatigue and low efficiency.

目前，我国很多企业在工作场所的布置上存在着不足，导致企业工人容易疲劳且工作效率较低。

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