Definition

Examples

• 这个透镜的焦距是多少？
  Zhège tòu jìng de jiāojù shì duōshao?
  What is the focal length of this lens?
• 科学家用透镜观察微小的生物。
  Kēxuéjiā yòng tòu jìng guānchá wēixiǎo de shēngwù.
  Scientists use lenses to observe tiny organisms.
• 他买了一对新的透镜来更换旧相机上的。
  Tā mǎi le yí duì xīn de tòu jìng lái gēnghuàn jiù xiàngjī shàng de.
  He bought a pair of new lenses to replace the ones on his old camera.