Idioms related to measurement include:
1. Mishaps arise unexpectedly: the occurrence of disasters cannot be predicted. It can be used as an object and attribute in sentences, and also in written language. This idiom comes from the 16th chapter of Happy Enemies, the owner of the West Lake Fisherman in the Ming Dynasty: If you delay, disasters arise unexpectedly, and it is too late to repent;
2. Unpredictable: It means that people's hearts are difficult to detect, and they are often used as predicates and attributes to express people's minds. From Huang Zongxi's "Zhang Cangshui Epitaph", the line of undead people's hearts is regarded as inspiring, but the situation is obvious and unpredictable;
3. Unfavorable: It refers to a person who has a certain idea, is malicious and unpredictable, and is often used as predicate, object, attribute and adverbial, with derogatory meanings. It comes from Lin Zexu's "Manuscript of Making Guangdong Play": and it is insidious and repeated;
4. Mysterious: The description is extremely wonderful. It comes from Liu Baiyu's Three Days of the Yangtze River: in the gorge, strong sunlight and milky white clouds are intertwined. A few steps away, there is sunshine on one side and clouds on the other, which is really mysterious;
5. Unpredictable: it describes many unexpected changes. It comes from Jiao Hong's "Yutang Congyu Literature": hundreds of thousands of words, which is powerful, ancient and unpredictable.