1. How to form words for solid: solid, stubborn, impregnable, solid, deep-rooted, solid, steroid, stubborn, stubborn, stable, self-sufficient, fixed price, dangerous solid, solid state, freezing point, nitrogen fixation, solid, Fixed capital, stubbornness, stubbornness, stubborn habits, cholesterol, fixed exchange rate, stubbornness, stubbornness, reinforcement, solid foundation, consolidation, fixation, stubbornness, guarantee, strong foundation, fixed assets, super solid state, northern solidity, strong foundation Solid foundation, solid foundation, fixed fund, fixed worker, stubbornness have been seen.

2. Gu is a Chinese character, pronounced as gù, which means strong and reliable.