缺少明确的法律定义也是警方解决这一问题为什么艰难的原因之一。
The lack of a clear legal definition helps to explain why the police have struggled to address the problem.
当生活中缺少明确的目标，我们就开始热衷于处理生活中的琐事。
In absence of clearly defined goals, we become strangely loyal to performing daily ACTS of trivia.
以电动葫芦为动力装置的简易升降机造价低廉，使用方便，但缺少明确的设计安装标准。
Simple elevator with electric hoist as power unit features low cost and ease of operation.
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