例句與造句

1. Active barrier creams containing silicone, tartaric acid, glycerin, and other ingredients are said to be beneficial for some chromate-sensitive construction workers.
2. Ralph Nasatka says the active barriers his Clinton, Maryland, company sells _ the kind that flip up to prevent a car from entering a secure area _ send an important message.
3. It's difficult to find active barrier in a sentence. 用active barrier造句挺難的