ultima ratio

例句：

1. 1. The engineer calculated the ultima ratio of the structure to ensure its stability.
   工程师计算了结构的极限比率，以确保其稳定性。
2. 2. The team achieved their ultima ratio in the competition, setting a new record.
   团队在比赛中达到了他们的极限比率，创下了新的记录。
3. 3.The scientist discovered the ultima ratio of the chemical reaction, which was crucial for understanding the process.
   科学家发现了化学反应的极限比率，这对于理解该过程至关重要。