缘故

cause;reason;motive
探明～ find(or seek,discover)the cause of/不知其中～ do not know the whys and wherefores of/无缘无故for no reason at all;without reason

• teeth
• teethe
• teetotal
• teetotum
• teg
• tegument
• telecast
• telecommunications
• telegram
• telegraph
• telemetry
• teleology
• telepathy
• telephone
• telephoto
• teleprinter
• teleprompter
• telescope
• teletypewriter
• television
• telex
• telfer
• tell
• teller
• telly