单词：experimental stage
experimental stage的用法和样例：
例句
- The equipment is still at the experimental stage.这种设备仍处于试验阶段。
- Despite the recent biologic and clinical advances, reproductive organ transplantation remains experimental and controversial.尽管最近的生物学和临床出现了进展，生殖器官移植仍旧处于试验阶段并存在争议。
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