2. Oilstone: Oilstone refers to fine oilstone, and oilstone refers to rough oilstone. Sharpening a knife refers to sharpening a stone, also refers to tempering and exercise, which is used to express revolutionary will and can also express mutual encouragement.
3. Hua Shao: Good times. Often refers to spring. Good times. Refers to youth.
4. Example: Our slogan is "Keep forging ahead, live up to your youth, seize the day and forge ahead!" .