名词
中文翻译：勃起
同义词：
['stand-up', 'erection']
例句：
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1. Hestood up and walked to the door.
他站起来走到门口。
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2. The doctor gave him aninjection to treat his erection.
医生给他注射了药物来治疗他的勃起。
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3. Aftera long day at work, he felta sudden erection in his pants.
工作了一整天后，他突然感到裤子里一阵勃起。