I don't understand this math problem. It's too difficult for me. （我不理解这道数学题。

对我来说太难了。）

She tried to explain it again, but I still didn't understand what she meant. （她又试着解释了一遍，但我还是不明白她的意思。）

Do you understand how to operate this machine? （你知道怎么操作这台机器吗？） We need to make sure that everyone understands the rules of the game. （我们需要确保每个人都明白游戏规则。）

He nodded his head to show that he understood what I said. （他点头表示他明白了我说的话。）

The teacher made the lesson interesting so that students could better understand the knowledge. （老师把课讲得很有趣，这样学生就能更好地理解知识。）

I finally understand why she was so angry with me yesterday. （我终于明白她昨天为什么对我那么生气了。）

They are having a meeting to discuss and understand the market situation. （他们正在开会讨论并了解市场情况。）

If you don't understand something, don't be afraid to ask questions. （如果你有不明白的地方，不要害怕提问。）

My grandmother doesn't understand modern technology very well. （我奶奶不太懂现代科技。）

The book is written in simple language so that children can understand it easily. （这本书用简单的语言写成，这样孩子们就能轻松理解。）

After reading the instructions several times, I began to understand how to assemble the furniture. （读了几遍说明书后，我开始明白如何组装家具了。）

We should try to understand different cultures and respect their differences. （我们应该努力了解不同的文化并尊重它们的差异。）

She listened attentively, trying to understand every word he said. （她专心地听着，试图听懂他说的每一个字。）

The coach explained the strategy again to make sure the players understood it. （教练又解释了一遍战术，以确保球员们理解了。）

I don't think he really understands the importance of this project. （我觉得他并没有真正理解这个项目的重要性。）

Can you help me understand this scientific theory? It's quite complicated. （你能帮我理解这个科学理论吗？它相当复杂。）

They spent a long time talking to understand each other better. （他们花了很长时间交谈，以便更好地了解彼此。）

You need to read the text carefully to understand its main idea. （你需要仔细阅读课文才能理解它的主要思想。）

Once you understand the principle, it will be much easier to solve the problem. （一旦你理解了原理，解决这个问题就会容易得多。

）