1. 借贷：on leave 休假 | on loan 借贷 | on many occasions 许多次

2. 借用;借调：on leave prior to retirement 退休前休假 | on loan 借用;借调 | on medical grounds 因健康理由;因健康欠佳

3. 出借：4. stack n. [常用复数]许多书架, 书库 | 6. on loan 出借 | 7. consult vt. 翻阅,查考

4. (租借)：go-ahead: permission to proceed(放行许可) | on loan: (租借) | take over: (接管)