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spYU*bJCR(fTK2Y~7-c。

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]!37AlC;6k)y。

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N0xZS)wH5697#(cX。

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sO#vVjQdhW。

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