减半法顾名思义，就是把库存减一半。在实践中，可以先从在制品库存做起，减少实施的风险。
如果你想遵循GTD法（完成任务法），就浏览一下你的待办事务清单，看看能不能将其减半。
If you’re following the GTD method (Getting Things Done), look at your list of to-dos and see if you could cut that list in half.
目的探讨二尖瓣狭窄伴反流的患者用压差减半时间(pht)法测量二尖瓣口面积的应用价值。
Objective To explore the clinical application of pressure half-time (PHT) method on rheumatic mitral stenosis coexisting mitral regurgitation.
方法分别应用二维法（2D法）、多普勒压力减半时间法（PHT法）及实时三维容积法（RT3DE）检测18例行PBMV患者手术前后MVA。
Methods MVA was estimated in 18 patients before and after PBMV, using two-dimensional echocardiography(2DE), Doppler pressure half-time(PHT) and volumetric RT3DE.
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