1.date back 回溯至

For a start, they date back to 1947.
首先，這些規定要追溯至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.
金屬咨詢公司cru group的分析師jim lin說，與伊朗鐵礦石供應商出現的問題有關的投訴可以追溯到2008年。
2.seem to 似乎

Financial markets seem to agree.
金融市場似乎也證實了這一點。

Investors seem to have noticed.
投資者似乎也注意到了。

3.in effect 實際上，事實上

And it is in effect blocked in china.
實際上臉譜網在中國是禁用的。

A nine-week-old ceasefire is supposed to be in effect.
長達九周的停火協議被認為仍有效。

4.point to 指向,針對

And all signs point to even more cuts ahead.
而各種跡象表明進一步的削減還有后頭。

In any case, signs point to a bird surge.
不管怎樣，種種跡象表明禽類的數量劇增。