angle of lead
(1)超前角
(2)前置角
(3)导程角
(4)移前角

• suboptical diffraction pattern
• suboptical frequency
• subpicosecond pulse
• subpicosencond
• subpower
• subprogram
• subroutine
• subset
• subshaft
• subshell
• subsidence
• subsidiary optical system
• subsonic
• substage
• substage condenser
• substance
• substandard
• substandard film
• substate
• substitution
• substrate
• substrate reflection polarizer
• substratosphere
• substructure
• subsystem