运输安全管理局不能继续将资源分散到未被充分利用的预检通道，而同时，大多数旅客却要排着不必要的队。
The TSA cannot continue diverting resources into underused PreCheck lanes while most of the traveling public suffers in unnecessary lines.
当原作者已充分表明观点时，引言能减少不必要的叙述。
Save unnecessary writing when ideas have been well expressed by the original author.
但幸运的是，就营养充分而言，如此高的摄入量是不必要的。
Fortunately, however, such high intakes are unnecessary for nutritional adequacy.
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