vain
/veɪn/
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adj. 徒勞的；自負的；愛虛榮的
- After several vain attempts to start the engine, the driver called a tow truck. 試了幾次都發動不了引擎，駕駛只好叫拖吊車。
其他意思
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adj. 徒勞的, 自負的
A vain attempt or action is one that fails to achieve what was intended.
- The drafting committee worked through the night in a vain attempt to finish on schedule
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