D

doctor

n. 医生 例句：You should see a doctor.

die

v. 死 例句：The old man died ten years ago.

dog

n. 狗 例句：The dog is friendly.

difficulty

n. 困难 例句：He has difficulty in learning physics.

distance

n. 距离 例句：The distance from my home to school is two kilometres.

dry

adj. 干的 例句：The clothes are dry now.