为了防止这样的情况发生，国际拍卖行以及卖家正在针对竞拍资格以及何时付款强化政策并执行更加严格的条款。
To prevent this, international auction houses and sellers are tightening policies and enforcing stricter rules about who can bid and when they will pay.
诗歌中对上文中一行或几行的重复，但每次重复都有一定的变化，而且每一节的重复中的叙述都有所强化。
The repetition of a previous line or lines, but with a slight variation each time that advances the narrative stanza by stanza.
均行多层螺旋CT平扫及增强检查，比较平扫、增强动脉期的强化幅度及特征。
Enhancement degree and characteristics in plain ct scan and arterial phase of enhancement were compared.
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