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.


New words:

calculate [ˈkælkjuleɪt] v. 计算;预测;核算;推测


Sample Sentences:

She learned to calculate area in math class.
We calculate that we will arrive at 3 o’clock.
Can you calculate the sum of these numbers?


New words:

fasten [ˈfæs(ə)n] v.扣紧;盯住;盖好;使牢固


Sample Sentences:

The dog fastened its teeth in his leg.
She fastened the belt loosely around her waist.
She got quickly into her car and fastened the seat-belt.