Using 945 steel and 921a steel, this article studies the effect of weld profile and size on the cracking behavior of a central notch in a three-notch specimen for an explosion bulge test.

选用水面舰艇用945钢和潜艇用921a钢，研究了不同焊缝外形尺寸对爆炸试验中三缺口试样的中央缺口开裂行为的影响。

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The central heating's thermostat may turn down a notch or two. A less thirsty car may sit in the drive.

也许会把中央空调调低一两格，或者买辆低油耗车子。

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The book's central theme is very appealing: correctly reared, any child can become if not a prodigy then at least a candidate for a top-notch school.

该书的中心主题非常有吸引力：正确饲养即使不能让所有孩子都能成为神童，也至少可以被顶尖学校录取。

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Credit Suisse took the biggest hit from the Moody's announcement, suffering a three-notch downgrade, just days after Switzerland's central bank warned it to bolster its capital.

CNN: Explainer: The power of credit rating agencies