VERBS | ADVERB | PREPOSITIONVERBS➤be成比例ADVERB➤approximately, roughly大致成比例◇The amount of food a child needs is roughly proportional to her size.小孩需要的食物量與其個頭兒大致成比例。➤directly成正比◇The speed of the glider is directly proportional to the speed of the wind.滑翔機的速度與風速成正比。➤inversely成反比◇The amount of force needed is inversely proportional to the rigidity of the material.所需要的力的大小與材料的硬度成反比。PREPOSITION➤to與⋯成比例