究竟什么可称作进攻性武器仍然难以界定。
Exactly what can be called an offensive weapon is still a grey area.
试图确定新几内亚的狩猎者和采集者面临着一个众所周知的难题：界定什么是狩猎者-采集者群体。
Attempts to identify New Guinean's hunter-gatherers face the well-known difficulty of defining what constitutes a hunter-gather group.
要评估市场上有没有充分的竞争，反托拉斯者得先界定市场是什么。
To assess whether there is a enough competition in a market, trustbusters must first decide what the market is.
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