advocate thriftiness and oppose extravagance的用法和样例：
- Taoism has always advocated thriftiness and plain life.
- We oppose extravagance and waste.
- We should advocate hard work and plain living and building our country through thrift and diligence, oppose extravagance and waste, cut all unnecessary administrative expenses, and ensure funding for priority areas.
- We support just wars and oppose unjust wars.