When people are of one mind and heart, they can move Mount Tai.

解释 ( paraphrase )
假如人的心一致了，泰山也能移走。
这条谚语告诉我们：只要大家团结一致，齐心合力，就会力量无比，什么困难都能克服，什么事情都能办到。

This proverb advises us that as long as we unite as one, we will be strong enough to do anything and overcome any difficulties.

齐：一致。
      Unity.

移：移动。
      To move.

泰山：是中国山东省内的一座有名的高山，常用来代表很高的山。
         A famous mountain in Shandong Province, which was the highest mountain known to Confucius. It symbolizes a towering peak.

同义词 ( synonym )
① 三人一条心，黄土变成金
② 二人同心,其利断金
③ 众人拾柴火焰高
④ 一个篱笆三个桩，一个好汉三个帮
⑤ 单丝不成线,独木不成林
⑥ 三个臭皮匠，顶个诸葛亮

造句 ( example )
俗话说，人心齐，泰山移。在企业管理过程中，出现人心不齐的现象，对企业的长期存在和发展是不利的。