Only legs but no arms, only spine but no brain. What animal is it? The answer is not an animal, but an everyday item: glasses.

Analysis:

1. Only legs but no arms: It is talking about the temples of glasses.

2. There is only a spine but no brain: there is a beam between the two lenses of the glasses.

3. Like to put on airs and sit cross-legged: When not in use, the temples of the glasses will be buckled together, like sitting cross-legged.

4. Across the bridge of the nose and hooking the ears: When wearing glasses, place them across the bridge of the nose and hook the legs of the glasses onto the ears.

Extended information

Riddle-solving skills:

1. Understanding method

Start from the meaning of the riddle, guess the answer, and then divide For forward buckle and reverse buckle. The former is like "The young man has slipped away, and the beautiful girl has fallen behind (the talent show is abbreviated as 2) - the fast boy and the super girl", and the latter is like "all the concubines are outside the door - (foreign female scientist) Marie Curie".

2. Pictogram method

Associate the answer to the mystery through pictograms. For example, "Keep making scissor hands and making donkey noises continuously (guess the luxury brand) - LV". From "scissor hands" we can associate it with "V", which is pictography. "Zhi" can be deducted from "丨", and "Zhi" is "L". As for "continuously making donkey noises", the prompts are to connect the answers to the riddles and pronounce them in the same way as the word "donkey". The homophonic duplication method is also used.

3.Method of metonymy

Find things related to the mystery through association, or use synonyms or pseudonyms for metonymy. Common ones include "Qianli" and "Horse", "Plum Blossom" and "Deer", etc. For example, "Pleiades Star Official told the Cowherd (a four-character Hokkien proverb) - a chicken talks to a duck."