a joyful look的用法和样例：
- He made a weak attempt to look cheerful.
- He pulled a long face when his father scolded him.
a joyful look的相关资料：
A cell a a village impoverished by flood a disinterested act of kindness A Theorem About Right Triangles a speech punctuated with cheers a portfolio of wines/courses A Course in College Mathematics a moderately prosperous society A flourishing new sports center a drop in prices/temperature a conservation-minded society