| 释义 |
天平tiānpíng较精密的衡器,根据杠杆原理制成。杠杆两头有小盘,一头放砝码,一头放要称的物体。杠杆正中的指针停在刻度中央时,砝码的重量就是所称物体的重量。多用于实验室和药房。{balance; scales; precision weighing instrument built on the lever principle. There are two matched shallow pans hanging on either end of a lever supported exactly in the middle, one pan for holding the weights and the other for sth. to be weighed. When the indicator in the middle of the lever stops at the centre of the graduation, the weight of the weights on the balance equals that of what is being weighed. Such instrument is usu. used in laboratories and pharmacies.} |