对水的最低需求量没有一定之规，通常随气温的上升和活动量增大而显著增大。
Minimum water needs vary with each situation but increase markedly with raised air temperature and physical activity.
这没有一定之规，但是呆到很晚总是不礼貌的，因为这就意味着对主人不够体谅。
There are no rules, but it is most impolite to stay too late, as it implies a lack of consideration for your hosts.
银行家获得的奖金依然没有一定之规，且受到无数因素的影响，不在自己的掌控之内。
The bonus a banker receives is still arbitrary and subject to countless forces beyond his control.
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