低下lower than the average standard; vulgar
低调mild or low-spirited view; low pitch/voice
低谷low lying valley; all time low
刁难make things difficult for somebody
地狱hell; dark and miserable living conditions
地理geography; geographical features of a place
垫put something under something else; pad
垫底rank at the bottom; use something as the base
定向find the direction; directional
帝国主义imperialism; imperial power
底线end/goal line; planted agent
底蕴detailed content; accumulation
掉头turn one's head away; make a U-turn
灯泡lamp globe; unwanted third person accompanying a courting couple
点火light a fire; stir up trouble
点缀adorn; use something merely for show/decoration
电报telegraph; use telegraph facilities to transmit texts, pictures, charts, etc.
电网electric/power grids; electric fence
登陆land; enter the market of an area or region
瞪open wide; glare with displeasure
订购place an order for something
调度organize and dispatch; dispatcher
蹬press down or push with the foot; step on
钓鱼angle; tricking people into falling for it