1.date back 追溯到
The caves date back to early Viking times in about 800 A.D..
这些洞穴可以追溯到公元800年的维京时代
2.come up with 提出,想出
Recently researchers have come up with a new theory.
最近研究人员提出了一个新理论
3.be made of 由……制成
Several of the modern-looking buildings turn out to be made of wood, straw and mud.
那些现代的建筑物实际是由木头、稻草和泥土建造的
4.in contrast to 相比之下
And yet Israel's mood, in contrast to Lebanon's, is remarkably upbeat.
然而与黎巴嫩形成鲜明对比的是,以色列的情绪明显很乐观
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[qh]