这种 zhè zhǒng 液体 yètǐ 天 tiān 冷 Lěng 时 shí 凝结 níng jié 得 dé 快 kuài 些 xiē .

This liquid gels faster in cold weather.

教 Jiào 了 le 一 yī 天 tiān 课 kè , 她 tā 精疲力竭 jīng pí lì jié .

At the end of a day's teaching, her nerves were absolutely shattered.

他 tā 讲 jiǎng 了 le 半天 bàn tiān , 我 wǒ 还是 háishi 糊里糊涂 tú .

After all his explanations , I remained none the wiser.

在 zài 下 xià 雨 yǔ 之前 zhī qián ,黑 Hēi 云 yún 使 shǐ 天空 tiānkōng 变得 biàn de 黑暗 hēi àn 了 le .

Thick clouds darkened the sky before the rain fell.