impede的例句（impede在句子中的用法）

• They also impede backmixing of sand. 同时也可防止砂子的返混.
• It was intended to impede the apprehension of the person. 它旨在妨碍对该人的拘押的.
• Severe steric effects at the reactive carbon would impede the substitution. 大的立体效应阻止在碳上的取代.
• At no time did I make an attempt to impede any investigatory effort. 我绝没有试图妨碍过任何调查工作。