The two men began to lay the groundwork for the airline plot when they returned to the UK from trips to Pakistan in December 2005.

2005年12月，他们结束巴基斯坦之行回到英国后，就着手为炸机阴谋打基础。

youdao

The review, launched last year, is seen as preparing the groundwork for the UK's renegotiation of its membership of the EU, as promised by David Cameron.

BBC: William Hague

In that sense the UK is the next big step, but one where a lot of groundwork in terms of visibility and awareness has already been generated.

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