1.date back 回溯至

For a start, they date back to 1947.
首先，这些规定要追溯至1947年。

Complaints about problems with iranian ore suppliers date back as far as 2008, said jim lin, an analyst with consulting firm cru group.
金属咨询公司cru group的分析师jim lin说，与伊朗铁矿石供应商出现的问题有关的投诉可以追溯到2008年。
2.seem to 似乎

Financial markets seem to agree.
金融市场似乎也证实了这一点。

Investors seem to have noticed.
投资者似乎也注意到了。

3.in effect 实际上，事实上

And it is in effect blocked in china.
实际上脸谱网在中国是禁用的。

A nine-week-old ceasefire is supposed to be in effect.
长达九周的停火协议被认为仍有效。

4.point to 指向,针对

And all signs point to even more cuts ahead.
而各种迹象表明进一步的削减还有后头。

In any case, signs point to a bird surge.
不管怎样，种种迹象表明禽类的数量剧增。