单词	焦度--倒焦距
释义	焦度；倒焦距focal power
随便看	balance tolerance balance tool balance-to-unbalance transformer balance transfer balance transformer balance-transformer balance transmission balance tree balance trial balance tube circuit balance-type potentiometer balance valve balance valve（spring and lever loaded valve） balance voltage balance wedge balance weigh-boat balance weighing position balance weight balance; weight balance weight [= counter weight] balance weight lever balance weights balance weight tensioner balance wheel balance-wheel