事实上研究显示经常节食会事得其反，会使减肥者前功后弃。
In fact, studies have shown that dieting often doesn't work — and diets may have the reverse effect, with dieters gaining back more weight than before they started.
因此，要获得合格的螺纹，功丝前的预孔径尺寸要一定控制得相当精确；
It causes the thread profile as shown in figure C. Therefore, it is important to control the hole diameter accurately to get qualified threads.
因此，要获得合格的螺纹，功丝前的预孔径尺寸要一定控制得相当精确；
It causes the thread profile as shown in figure C. Therefore, it is important to control the hole diameter accurately to get qualified threads.
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