temperamental
[ˌtɛmprəˈmɛntl:, ˌtɛmpərə-]
adj.
气质的;
性格的;
不可靠的;
喜怒无常的;
例句:
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Frequently, the inventions were fragile and temperamental prototypes.
来自BBC
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I first started cruising in yachts with temperamental petrol engines.
我刚开始驾驶游艇航行时，艇上的汽油发动机老出毛病。
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Vickers machine-guns could be temperamental.
维克斯机枪有时会出故障。
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He is very temperamental and critical.
他好使性子，还爱挑毛病。
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Others recall Mr. Pistorius as prone to temperamental behavior.
来自WSJ
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I love her, temperamental little spitfire that she is.
来自R. Rendell