在过去150年里，干旱已经对森林和树胶产品造成了损害。
In the past 50 years, drought has taken a toll on the forests and on the production of gum.
比如，这里就有两款产品，其含有瓜尔胶羟丙基三甲基氯化铵和一些硅树胶（如季铵盐-80就有确实的护理效用）。
For example, here are two examples that contain guar hydroxypropyltrimonium chloride and certain silicones like Quaternium 80 that have substantial conditioning effects.
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