34. All time is no time when it is past.
35. Time lost cannot be recalled.
时光一去不复返。
岁月既往，不可复追。
36. Pleasant hours fly past.
快乐时光去如飞。
37. Happiness takes no account of time.
欢娱不惜时光逝。
38. No one can call back yesterday.
39. Yesterday will not be called again.
昨日不复来。
逝去的光阴不复还。
40. No man can call again yesterday.
无人能唤回昨天。
光阴一去不复返。