binocular microscope
双目显微镜，双筒显微镜

• level meter
• level multiplicity
• levelness
• level of feeling
• level of significance
• levels
• level sensitivity
• level surface
• level surve
• level tester
• level tryer
• lever
• lever arm
• lever-arm ratlo
• lever crank mechanism
• lever-type dial indicator
• levgeling mirror
• leviation
• levorotation
• Levortary
• levortator
• lgith gide
• liar
• liberation
• libraary automotion