凝
níng
to congeal
to concentrate attention; to stare
天冷的时候，水会凝成冰。
tiān lěng de shí hou, shuǐ huì níng chéng bīng。
When the weather is cold, water will congeal into ice.
她凝视着窗外，好像在想什么事情。
tā níng shì zhe chuāng wài, hǎo xiàng zài xiǎng shén me shì qing。
She stared fixedly out of the window, as if thinking about something.