恍然大悟

局势的发展可谓恍然大悟，出乎了许多人的预料。

jú shì de fā zhǎn kě wèi huǎng rán dà wù, chū hū le xǔ duō rén de yù liào.

The development of the situation can be said to be a sudden awakening, beyond many people's expectations.

听完物理特级教师在白板上用几何图形画出的辅助推导线，困惑已久的学生们顿时恍然大悟、豁然开朗。

tīng wán wù lǐ tè jí jiào shī zài bái bǎn shàng yòng jǐ hé tú xíng huà chū de fǔ zhù tuī dǎo xiàn, kùn huò yǐ jiǔ de xué shēng men dùn shí huǎng rán dà wù, huò rán kāi lǎng.

After listening to the auxiliary derivation lines drawn by the physics master teacher using geometric figures on the whiteboard, the students who had been confused for a long time suddenly became enlightened and enlightened.