As one of these components, friction modifier plays an important function for removing the dirt and colored substance attached to the surface of tooth.
磨擦剂作为牙膏的组分之一，在其中起着重要的作用，它能有效的除去附着在牙齿表面的污垢和有色物质。
Third, Miao silver is a product of history, but also to participate in the social life and in which play an important role, plays a social function can not be ignored.
再次，苗族银饰固然是历史的产物，但同时也参与着社会生活并在其中扮演着重要的角色，发挥着不可忽视的社会功能。
At present, example education in our schools still plays an important educational function, but there is no practical results, and investment and its effectiveness are out of proportion.
当前，榜样教育在我国学校教育中仍然发挥着重要的教育功能，但也存在着实效性不高，其投入和成效不成比例的问题。
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