Ultrasonic distance meterDocument Type and Number:United States Patent 5442592Abstract:An ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measur
爱财如命 love money as one loves one's life/love money as much as life itself. 爱理不理 look cold and indifferent 爱莫能助 willing to help but unable to do so 爱屋及乌 love for a person extends even to the crows on h