类在方法调用之前和之后必须保持不变(一旦对象已经构建)。
A class invariant must hold before and after all method calls (once the object is constructed).
研究人员说：这些位点必须保持不变，才能保证病毒正常生存和复制。
Researchers believe these sites must remain unchanged for the virus to survive and replicate properly.
所有域名可以保持不变，但是它们的IP地址必须改变。
You can keep all of your domain names, but their IP addresses have to change.
法律必须保持稳定但却不能一成不变。
如果你的体重保持不变，你必须使用你所有的卡路里，但如果你增加体重然后一些你消耗的卡路里作为脂肪存储。
If your weight remains constant you must be using up all your calories, but if you are gaining weight then some of the calories you consume are being stored as fat.
如果助走的时间想保持不变，那么走步的速度就必须加快或减慢。
If the time the steps take remains the same, the walking speed must be fast or slower.
结论是若保持上浆率不变而要降低Q，则必须增加浆槽中浆液含固率。
It is found that if we expect to maintain a constant size pickup while reducing the Q, we must increase the solid percentage in the size VAT.
如果指定了版本号，则版本号必须增加或保持不变。
If specified, version Numbers must increase or stay the same.
您必须保持一成不变的生活方式和良好的卫生习惯，这样才可以去掉身上多余脂肪，保持体重。
You must make permanent changes in your lifestyle and health habits to lose significant weight and keep it off.
波义耳定律指出要使地狱的温度和压力保持不变，灵魂的质量与体积的比率必须是不变量注3。
Boyle's Law states that in order for the temperature and pressure in hell to stay the same, the ratio of the mass of souls and volume needs to stay constant.
波义耳定律指出要使地狱的温度和压力保持不变，灵魂的质量与体积的比率必须是不变量注3。
Boyle's Law states that in order for the temperature and pressure in hell to stay the same, the ratio of the mass of souls and volume needs to stay constant.
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