一阵: a burst, a fit, a peal, a spell (period of time)...
动力: motive power, force, motivation, impetus...
观测: to observe, to survey, observation (scientific etc)...
启程: to set out on a journey...
开朗: spacious and well-lit, open and clear, (of character) optimistic, cheerful, carefree...
警车: police car...
零星: fragmentary, random, bits and pieces, sporadic...
进口: to import, imported, entrance, inlet (for the intake of air, water etc)...
啦: sentence-final particle, contraction of, indicating exclamation, particle placed after each item in a list of examples...
插嘴: to interrupt (sb talking), to butt in, to cut into a conversation...
