New words：

balance ['bæləns]
n.平衡；均衡
v.使(在某物上)保持平衡

Sample Sentences：

The dolphin balanced the ball on its nose.
When you learn to ride a bicycle you must learn to balance.

I found it hard to keep my balance on the icy path.
The girl lost her balance and fell off the balance beam.

New words：

recycle [ri:'saikl] v.回收利用；再利用；再次应用；再循环

Sample Sentences：

You must recycle your rubbish.
Instead of throwing away the rubbish, why not recycle it?
In Beijing many people recycle glass beer bottles and old newspapers.

New words：

cycle ['saikl]
n.循环；周期；自行车；摩托车
v.骑自行车；骑自行车旅行

Sample Sentences：

He goes to work by cycle.
Cycling is Europe's second most popular sport.
She cycled round the corner, lost her balance and fell off.

A cycle of the sun takes a year.
The seasons of the year spring, summer, autumn and winter make a cycle.

balance ['bæləns] n.平衡；均衡

New words：

available [ə'veiləbl] adj.可获得的；可购得的；可找到的；有空的

Sample Sentences：

Do you have a room available?
The doctor is not available now.
The swimming pool is available only in summer.
The season ticket is available for three months.
My bicycle is not available, and it is being repaired.

New words：

avail [ə'veil] v.有用；有帮助；有益
to no/little avail 没有什么效果；不成功
of no/little avail 没有什么用处；没有用

Sample Sentences：

This medicine is of no avail.
We tried to keep him alive but to no avail.
The medicine did not avail against the disease.
He tried and tried but all his efforts were of no avail.