New words：
bury [ˈberi] v. 埋葬；埋藏；使沉浸于；使专心于
Sample Sentences：
He buried himself in reading all day.
The house was buried under ten feet of snow.
Your letter got buried under a pile of papers.
In peace, sons bury their fathers; In war, fathers bury their sons.
New words：
detect [dɪˈtekt] v. 发现；查明；侦察出detection [dɪˈtekʃən] n. 探测；发现；侦查；察觉
Sample Sentences：
Mistakes should be corrected as soon as detected.
The tests are designed to detect the disease early.
Police use dogs for the detection of drugs.
The detection of the virus needs special tests.
New words：
detective [dɪˈtektɪv] n. 侦探；警探；私人侦探
Sample Sentences：
He buried himself in his detective story again. Detectives have spent months gathering evidence.
A private detective had been tailing them for several weeks.
bury [ˈberi] v. 埋葬；埋藏
detect [dɪˈtekt] v. 发现；查明；侦察出
detection [dɪˈtekʃən] n. 探测；发现；侦查；察觉
New words：
thread [θred]
n.(棉、毛、丝等的)线；线索；思路；脉络
v.穿过；穿（针）
Sample Sentences：
Grandma sewed my trousers with thread.
The detective found a new thread in the case.
I'm afraid I've completely lost the thread of what you were saying.
The waiters threaded between the crowded tables.
It took me a long time to thread my way through the crowd.
detective [dɪˈtektɪv] n. 侦探；警探；私人侦探
New words：
calculation [ˌkælkjəˈleɪʃ(ə)n] n. 计算；预测；估计；算计
calculator [ˈkælkjəˌleɪtər] n. 计算器
Sample Sentences：
He made a mistake in his calculation.
Her calculation of the total was correct.
I can't work it out in my head ─ I need a calculator.