set in stone 

If an agreement, policy, or rule is set in stone, it is completely decided and cannot be changed.

如果一項(xiàng)協(xié)議、政策或規(guī)則是set in stone(固定不變的)，意思是它已經(jīng)完全決定了，不能改變。

The relationship between popcorn and the movies was really set in stone during World War II.

在二戰(zhàn)期間，爆米花和電影之間的關(guān)系一度如同板上釘釘般堅(jiān)定。

not be set in stone

to be able to be changed

還未確定;未成定局

These are just a few ideas - nothing is set in stone yet.

這還只是一些想法——什么都還沒定下來(lái)。

（素材來(lái)源網(wǎng)絡(luò)，如有侵權(quán)請(qǐng)聯(lián)系刪除）