act of ratification and acknowledgement的用法和样例：
- Instruments of ratification and accession shall be deposited with the Director General.
- The present treaty shall come into force on the date of the exchange of the instruments of ratification and shall remain in force for a period of ten years.
- The act of making null and void.
废除使 ... 作废和无效
- In the act of bending down, he slipped and hurt his back.