New words：
staircase [ˈsterˌkeɪs] n. 楼梯
Sample Sentences：
We must redecorate the staircase.
She was sitting on the bottom step of the staircase.
Old people must be very careful as they climb a staircase.
In case of fire, please follow the direction of arrow and take the nearest staircase.
New words：
opposed [ə'pəuzd]
adj.截然不同；强烈反对；反对的；敌对的；对立的
v.“oppose”的过去式和过去分词
opposed to sth 反对
as opposed to （表示对比）而，相对于；而不是
Sample Sentences：
He was strongly opposed to the idea.
His father opposed his plan to work abroad.
I am here on business as opposed to a holiday.
200 attended, as opposed to 300 the previous year.
New words：
oppose [ə'pəuz] v.反对；抵制；阻挠
Sample Sentences：
He is strongly opposed to the plan.
They opposed the government's new policies.
He threw all those that opposed him into prison.
New words：
opposite ['ɔpəzit]
n.反面；对立面；对立的人（或物）
adj.对面的；另一边的；相反的；迥然不同的
prep.与…相对；在…对面；与…合演；与…联袂演出
adv.在对面
Sample Sentences：
Black and white are opposites.
The post office is opposite the bank.
I sat opposite to him during the meal.
Jack is kind; his wife is just the opposite.
They have opposite views on the question.
I asked the man opposite if he would open the door.
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.