New words:

challenge [ˈtʃæləndʒ]
n.挑战;质疑
v.向(某人)挑战;考查;盘问;对…怀疑(或质疑)


Sample Sentences:

He raised a challenge to the decision.
This math problem is a ​​challenge​​ for most students.
The teacher gave us a ​​challenge​​ to read 10 books this month.

Tom ​​challenged​​ me to a race after school.
The police ​​challenged​​ his ID at the airport.
Their school challenged ours to a football match.
I don't have the courage to challenge my boss's decision


New words:

record /ˈrekɔːd/ n.记录;唱片;记载;经历


Sample Sentences:

She loves listening to jazz ​​records​​.
The police checked his criminal ​​record​​`.
His sports ​​record​​ includes many awards.
She broke the world ​​record​​ in swimming.
The school has a ​​record​​ of all students’ grades.


New words:

record /rɪˈkɔːd/ v.记录;录制;记载;录(音);(仪器)显示,标明​


Sample Sentences:

The thermometer ​​recorded​​ 38°C.
The device ​​records​​ the speed of the car.
She ​​recorded​​ her daily thoughts in a diary.
I want to ​​record​​ my favorite radio program.
They ​​recorded​​ a video message for their grandma.
The teacher asked us to ​​record​​ the experiment steps.


record /ˈrekɔːd/ n.记录;唱片;记载;经历

New words:

millimetre [ˈmɪlɪˌmitər] n.毫米;千分之一米
millimeter [ˈmɪlɪˌmitər] n.毫米;千分之一米


Sample Sentences:

One centimetre equals ten millimetres.
These jellyfish were only one millimetre long.
Brisbane recorded 790 millimetres of rain in a week.
The land moves northwest by four millimetres per year.


New words:

centimetre [ˈsentɪˌmitər] n. 厘米

centimeter [ˈsentɪˌmitər] n. 厘米


Sample Sentences:

There are 2.54 centimetres to an inch.
One hundred centimeters make one meter.
One centimeter is equal to 10 millimetres.
Mr Zebra is 10 centimetres taller than Mr Deer.


millimetre [ˈmɪlɪˌmitər] n.毫米;千分之一米
millimeter [ˈmɪlɪˌmitər] n.毫米;千分之一米