① oscillation: vibration, mainly in the physical sense. Shock: Turbulence, often used in abstract things such as spirit. (2) Take things as they are: In case of unfavorable or abnormal situations, we will still treat them calmly as usual. Happy-go-lucky: can adapt to all kinds of encounters, no matter what the situation, get along safely. It can mean "I don't care about any encounter", but the former mostly means that I can still be the same as usual in a difficult situation, while the latter emphasizes that I can adapt to any environment. (3) just right: (talking and doing things) just right. Emphasize "just reached the best level." Appropriateness: (Speaking and doing things) Appropriate, safe, just right, and in line with discretion.