New Words：

submarine ['sʌbməri:n]
n.潜水艇
adj.水下的；海底的

Sample Sentences：

The submarines surfaced.
The submarine rose to the surface.
Why can a submarine float and sink?
Submarine earthquakes often happen in ocean.

New Words：

sentence ['sentəns]
n.句子；判决；判刑；宣判
v.判决；判刑；宣判

Sample Sentences：

The judge passed sentence.
The judge will pronounce sentence today.
The man was sentenced to three years in prison.
A sentence usually contains a subject and a verb.

New Words：

pronounced [prə'naunst]
v.“pronounce”的过去分词和过去式
adj.显著的；很明显的；表达明确的

pronunciation [prə.nʌnsi'eiʃən] n.发音, 读音

Sample Sentences：

I'm a man of pronounced views.
She pronounced herself satisfied with the results.
The two words are spelled differently, but pronounced the same.

You need to work on your pronunciation a bit more.
You should look up the right pronunciation of this word in the dictionary.

New Words：

pronounce [prə'nauns] v. 发音；读（音）；正式宣布（或公布、授予等）

Sample Sentences：

I don't know how to pronounce this word.
The doctors pronounced that he was no longer in danger.
The judge pronounced a sentence of death on the murderer.
She knows a lot of French words but pronounces them incorrectly.

sentence ['sentəns] n. 句子；判决

New Words：

trip [trip] v.绊倒；将…绊倒；使跌倒；脚步轻快地走（或跑、跳舞）

trip up 绊倒；把…绊倒；出差错

Sample Sentences：

The child tripped lightly like a bird.
They planned to make a wedding trip to Paris.
She tripped and fell last night and broke her hip
As I passed, he stuck out a leg and tried to trip me up.