副词
中文翻译：Unknown
同义词：
['unguarded', 'unprotected', 'unprotected', 'unprotected']
例句：
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1. She was off her guard when she met the stranger.
她遇到陌生人时没有防备。
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2. The team was off their guard when they faced the unexpected challenge.
面对突如其来的挑战，团队没有防备。
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3. He was off his guard when he saw the new boss.
他看到新老板时没有防备。