A tall order to fill的用法和样例：
- It is a tall order to expect me to finish the job in two days. It will take a week at least.
- a tall order to fill.
- If is rather a tall order to get all that work completed in less than a week.
- He issued a tall order that no one could comply with.
- It was a tall order to ask him to be a partner in launching a new initiative of undefined duration when he was contemplating his own demise.