New Words：

scream [skriːm]
n.尖叫；尖锐刺耳的声音
v.尖叫声；高声喊

Sample Sentences：

Someone was screaming for help.
He covered her mouth to stop her from screaming.

They ignored the baby's screams.
A scream broke the silence of the night.

silence [ˈsaɪləns]
n.沉默；寂静；无声
v.压制；使安静；使不说话

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