New words：
strength [streŋθ] n.强度；力量；实力；力气；体力
Sample Sentences：
Union is strength.
The medicine has lost its strength.
He hasn't got enough strength to remove that stone.
He's saving his strength for the last part of the race.
New words：
renew [ri'nju:] v.更新；更换；重新开始；中止后继续
Sample Sentences：
Spring renews the earth.
He renewed the book for another two months.
The most important thing is to renew your health.
I came back from my holiday with renewed strength.
strength [streŋθ] n.强度；力量；实力；力气；体力
New words：
reunion [ri:'ju:njən] n.团聚；聚会；团圆；重逢
Sample Sentences：
Our family has a yearly reunion.
We have a family reunion every New Year's Day.
The class reunion brought back a lot of memories.
The reunion gave us a chance to renew old friendships.
renew [ri'nju:] v.更新；更换；重新开始；中止后继续
New words：
union ['ju:njən] n.联盟；工会；联合；联合会
Sample Sentences：
Spain is part of the European Union.
He was elected the leader of the union.
The union struck for better work conditions.
The Student Union is holding election today.
New words：
worldwide ['wə:ldwaid]
adj.影响全世界的；世界各地的
adv.全球性地；世界范围地
Sample Sentences：
There are 15 species of cranes worldwide.
Only 22 percent of forestland worldwide is protected.
Almost 1.5 million people have now died of COVID-19 worldwide.