research subject
英[riˈsə:tʃ ˈsʌbdʒikt]
美[rɪˈsɚtʃ ˈsʌbdʒekt]
研究课题
[例句]Laser lightning rods have been a research subject for several decades , because they could trigger lightning and guide it to a specific place.
激光避雷针已经是一个研究了几十年的课题,因为它可以诱发闪电并把闪电引导至指定地点。
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