There is no cast-iron [fixed] rule.

没有一成不变的规则。

《新英汉大辞典》

Fixed an issue where attempting to use some instant cast spells with Auto-Dismount in Flight checked in the interface would fail.

修正了一些在勾选了“施法后自动下马”后一些瞬发技能不能正确自动下马的问题。

youdao

Cast iron platform USES: used for machinery, engine power test, commissioning, and has good stability and toughness flat surface with T-slots, can be used to fixed laboratory equipment.

铸铁平台用途：用于机械、发动机的动力实验，设备调试，具有较好的平面稳定性和韧性，表面带有T型槽，可以用来固定实验设备。

youdao

The hipsters' fondness for all things twee and retro - baking cupcakes, riding fixed-wheel bikes, using Polaroid cameras instead of digital - meant Christmas jumpers could be re-cast as modish.

BBC: The rise of ironic Christmas jumpers