adopt a constitutional amendment的用法和样例：
- Reactionary forces in the Senate would not allow a constitutional amendment for direct election of senators to pass.
- But Mr Topi is expected to push for a constitutional amendment to set a time limit.
- Germany, for instance, recently passed a constitutional amendment to limit the build-up of debt.
- This assembly should function as the supreme organ of state authority to decide on the policies for saving the nation,adopt a constitutional programme and elect the government.