His face cracked into a smile.

他脸上绽出了微笑。

《牛津词典》

Inside the reactor the large molecules are cracked into smaller molecules.

在反应堆内部大的分子被裂解为较小的分子。

youdao

Indole must be hydrogenated into indoline, and then indoline would be cracked into aniline and ammonia quickly.

吲哚需先加氢生成二氢吲哚，二氢吲哚快速裂化转化为苯胺和氨。

youdao

Unlike the others, he had a lively face, which sometimes cracked into a malevolent smile.

NEWYORKER: Election, Monitored

She cracked the first egg into the pool of fat she made by tilting the pan.

NEWYORKER: The Woman of the House

She cracked a couple of eggs into the pan, broke up the yolks, and stirred them with a cooking fork, then sliced a muffin and put it into the toaster.

NEWYORKER: Free Radicals