A: What about visiting the Great Wall this weekend? The weather is great tomorrow.
A: 这个周末去登长城怎么样？
B: That's a good idea.
B: 好主意。
C: Great.
C: 太好了。
B: Could you introduce it for us?
B: 你可以先给我们介绍一下吗？
A: OK! The Great Wall is one of the wonders of the world. And nowadays it acts as not a defense1 against the offensive, but the precious historical relic2 which welcomes tourists from all over the world. And we'll know more about it through the guide's introduction.
A: 好的。长城是世界奇观之一，现在它并不像古代一样是军事防御，而是作为一个历史古迹欢迎全世界的游客。我们明天会通过导游的介绍知道更多。
B: When will we get out tomorrow?
B: 明天我们什么时候出发？
A: How about 7 o'clock?
A: 7点怎么样？
C: That's OK.
C: 好的。
重点讲解：
Defense n. 防御
Precious adj. 珍贵的
相关词汇：
infrequent; precious; rare; valuable; dear例如:
An infrequent visitor 一位稀客
Precious words 珍贵的话
Rare animals 奇异的动物；rare birds 珍禽
Valuable perfume 高贵的香料
Dear How pure, how dear their dwelling-place. 指明它的来处纯洁而珍贵。
Relic n. 估计
Historical adj. 历史的
小贴士：我们跟外国人介绍景点时，需要加一句类似“The weather is wonderful.”之类的话，另外，还要赞美一下所去景点的美丽或历史。