What is the principle of using quantifiers?

Quantifiers are words that represent people, things or action units. Such as a lift, a horse, a head, a horse, etc. There is a sentence in the article "Fishing for Iron Cattle" in the sixth volume of the five-year short story: "The monk dragged eight (only) heavy iron cows back one by one in this way." I think it is more appropriate to change "only" to "head". After discussion, some teachers in our school think that "only" generally modifies smaller animals, such as "an ant" and "a wild goose"; "Head" generally modifies a larger animal, such as "an elephant". However, it is puzzling that there is still a sentence in the textbook: "His eyes are red, like an angry leopard, and his appearance is terrible." (Monument) "We boarded a (only) light blue seagoing ship." To this end, I want to ask: is the use of quantifiers in accordance with established language habits or grammatical norms? Is the collocation of these quantifiers and headwords scientific in the teaching materials? Zhou Honghua of Jiangxi Guangfeng Experimental School has a complicated Chinese quantifier, which also has the function of expressing image characteristics. When choosing, we should focus on image, at the same time, we should follow habits and pay attention to flexibility. If the use of quantifiers does not follow these principles, it will make jokes about "a cow", "a dog" and "a". The so-called "image-oriented" is to keep the image once expressed by quantifiers consistent with the image of the central word it restricts and explains. For example, "Zhang" originally meant to be "enlarged due to expansion" and once expressed the image of "larger and thinner plane". Then, for things with large plane and thin thickness, we should use "Zhang" as quantifier, such as "a piece of paper" and "a piece of skin". Another example is that "block" originally refers to clod, which contains the image of "flat and thick". Then, if there is something flat and thick, it is more appropriate to use "block" as quantifier, such as "a brick" and "a bar of soap". The selection of some quantifiers emphasizes the correlation with the following nouns, which is actually an extension of the principle of visualization. For example, the hat is related to the top of the head, the lock is related to the door handle, and the home is related to the door, so a hat, a lock and a home are said. The so-called "follow the habit" means not to break the collocation habit of some quantifiers and headwords casually. For example, when the prefix is an animal name, quantifiers are often chosen like this: head-cow, pig, lion, undressed dog, cow, horse, only- chicken, duck, cat, sheep, rabbit and so on. The so-called "pay attention to flexibility" refers to breaking the habit according to the actual situation and some needs of expression. For example, it is customary to say "head" to cattle, but "iron cow" is not a real live cow, so it is better to use "only" than "head". Another example is that "leopard" is generally called "only", but saying "a leopard" is exaggerated. There is a saying of "a big mouse" in Lu Xun's novels. Another example is that "ship" is generally called "ship" or "only" (not necessarily a ship), which also reflects the flexibility of application. Chinese teachers in primary schools