retaining rings的用法和樣例：
例句
- This article has described expanding method for repairing the concave retaining ring caused by the hydraulic bulging.
詳細介紹了用擴沖法對液壓脹形出現凹形的護環進行修復的方法。 - The die and eqiupment of internal pressurized expanding retaining rings and double cone wedge-reaming die were also studied.
對內增壓擴脹護環的裝置和雙錐面楔塊擴孔模具進行了研究。
