The plural 's' is not a free form, as it must always be attached to a noun.
表示复数的s不是自由语素，必须附着于名词。
"If she says that, it must be a nice song," Colin answered.
“如果她这么说，那一定是一首好歌。”科林回答。
If it walks like a duck and quacks like a duck, it must be a duck.
如果它像鸭子一样走路，像鸭子一样呱呱叫，那它一定是一只鸭子。
Now it must be known that, among all his friends, Pinocchio had one whom he loved most of all.
现在大家得知道，在皮诺乔所有的朋友中，有一个是他最喜欢的。
It is vital that once an institution claims to be particularly good at something, it must live up to it.
至关重要的是，一旦一家机构声称自己在某方面特别擅长，它就必须做到这一点。
In order for a chemical to be considered a drug, it must have the capacity to affect how the body works.
为了使一种化学物质被认为是一种药物，它必须具有影响人体运作的能力。
The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen.
最好的信号不仅取决于它的亮度，还取决于它与背景的对比度。
Critics seem to presuppose that great literature must be somehow burdensome to the reader; it must be difficult for the uninitiated to understand.
评论家们似乎预设伟大的文学作品对读者来说一定是某种负担；外行人一定很难理解。
A young man sees a sunset and, unable to understand or to express the emotion that it rouses in him, concludes that it must be the gateway to a world that lies beyond.
一个年轻人看到日落，由于无法理解和表达日落在他心中唤起的激情，便得出结论：落日处想必是通往遥远世界的大门。
It's a sculpture carved from the tusk of a mammoth—it must have been towards the end of the tusk, because it's slim, slightly curved.
这是一件用猛犸象的象牙雕刻而成的雕塑——肯定是象牙接近尾端的部分，因为其形状纤细、略呈弧形。
"You knew it must come to this, sooner or later, Toad," the Badger explained severely.
“你知道迟早肯定会有这种结果的，托德。”獾子班杰严厉地解释道。
"I think it must be the field-mice," replied the Mole, with a touch of pride in his manner.
“我想一定是田鼠们来了，”莫尔回答说，脸上带着一丝骄傲。
If reading is to learn anything more than passing time, it must be active.
如果读书是为了学到点什么，而非仅仅为消磨时间，那它必须是主动的。
The principles have to be engrained, it must be the way one thinks.
这些原则必须深入人心，直到变成一个人的思维方式。
If you have a good story idea, don't assume it must form a prose narrative.
如果你有个不错的故事构想，别只想着它得是篇散文式的记叙体。
Not that learning is to be despised, but that it must be allied to goodness.
不是说可以轻视学识，而是学识必须与美德结为盟友。
Therefore if the world wants to reduce emissions, it must stop deforestation.
因此，如果世界希望减少碳排放，就必须停止砍伐森林。
Now all it can face is the noise; it must stare the messiness of life in the eye.
现在它所面对的只剩下噪音；它必须直面生命的杂乱。
I believe it must be the desire of the German people too to know more about China.
我相信，德国人民也愿意更多地了解和认识中国。
For such a spirit to take hold, it must become an integral part of the company's culture.
这类精神要在企业内生根，它必须要成为企业文化的一个有机的组成部份。
FOR a businessman, if there is anything better than making money, it must be making more money.
对于生意人来说，如果有什么事情比赚钱更好的话，那一定是赚更多的钱。
The butterfly in the garden to get the joy, it must first endure and chrysalis broken pain.
蝴蝶如要在百花园里得到飞舞的欢乐，那首先得忍受与蛹决裂的痛苦。
Whatever transformation you want to bring about in yourself and in the world, it must be now.
不论你想带给自己或世界何种转变，转变的时刻都在现在。
We must not be enemies. Though passion may have strained, it must not break our bonds of affection.
尽管人们的情绪也许已经很紧张，我们也绝不能破坏我们友爱的纽带。
If the frog wants to see the outside world, it must jump out of the well to broaden its range of vision.
如果这只青蛙想看到外面的世界，它必须从井底跳出来开阔自己的视野。
Whatever form it takes, it must be a living, breathing entity that's easy to update and easy to reference.
无论是何种形式，都必须是一个充满活力的实体，能方便地进行更新和引用。
If it cannot be destroyed, it must then, according to Dr. Einstein, be transformed into another form of energy.
如果它不能凭空消失，根据爱因斯坦所说，它一定会被转换为另一种形式的能量。
If it cannot be destroyed, it must then, according to Dr. Einstein, be transformed into another form of energy.
如果它不能凭空消失，根据爱因斯坦所说，它一定会被转换为另一种形式的能量。
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