没有绝对的，不变的道德准则。
你们的价格是固定不变的吗？
语言从来都不是一成不变的。
理由在变，但对更多树木的渴望是不变的。
The justifications change. The desire for more trees remains constant.
因此，理想的演讲应该是充满事实的、并以不变的单一语调进行的。
Thus the ideal lecture is one filled with facts and read in an unchanged monotone.
我们关心的大多数过程都是在保持压强、温度或体积不变的情况下发生的。
Most processes that we're concerned with will happen with something held constant like pressure or temperature or volume.
无论是英式早餐还是咖啡加三明治，有一样东西是保持不变的，那就是价格。
Whether it's an English-cooked breakfast or a coffee and a sandwich, one thing has remained the same: the prices.
他指责政府依赖一成不变的政策。
He accused the government of relying on paint-by-numbers policies.
他们对朋友不变的忠诚。
他最持久不变的特质是孩子般的天真无邪。
他只是抛出个想法供讨论，不是固定不变的。
He is merely throwing the idea forward for discussion, it is not cast in stone.
他对这门手艺有着一种发自内心和持久不变的热爱。
很多商人认为，一个相对价格从来不变的地方会是极乐世界。
Many businessmen think that a world where relative prices never varied would be nirvana.
他们对魔法的信仰是永恒不变的。
如今，公司不是一成不变的了。
生活对你来说总是一成不变的。
这些对联的内容和位置都是一成不变的。
这并不是说生物钟的周期是固定不变的。
This is not to suggest that the period of this biological clock is immutably fixed.
厌倦了一成不变的外观？
事实上，海洋无脊椎动物不变的外壳是通过1亿年前的沉积物发现的。
Indeed, unaltered shells of marine invertebrates are known from deposits over 100 million years old.
这里的成本削减定义为在保持劳动力数量不变的情况下提高劳动力产出。
Cost-cutting here is defined as raising labor output while holding the amount of labor constant.
但无论是英式早餐还是咖啡加三明治，有一样东西是保持不变的：价格。
But whether it's an English-cooked breakfast or a coffee and a sandwich, one thing has remained the same: the prices.
新娘或新郎不再带着对生活方式或工作保障终身不变的期望而步入婚姻。
A bride or groom can no longer go into a marriage with lifelong expectations of lifestyle or job security.
就这样，我上路了。带着四个孩子和一只小羊羔，以及支撑我走下去的永恒不变的乐观主义精神。
That is how I found myself on the road with four kids, a baby lamb and nothing but my everlasting optimism to see me through.
从我很小的时候，就有一个固定不变的传统，长途驾车穿越新英格兰去见证树叶的变化，享受糖和甜甜圈。
From my earliest years, it became a solidified tradition to go on long drives throughout New England to witness the foliage change, snack on candy and donuts.
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