1. pin down

確定；使受約束；阻止

eg. It has taken until now to pin down its exact location.

一直到現(xiàn)在才確定了它的準(zhǔn)確位置。

eg. We should use our secondary forces to pin down several enemy columns.

我們應(yīng)該用助攻部隊(duì)來牽制住敵人的幾個(gè)縱隊(duì)。

2. early stage

早期，初期

eg. But this is only at an early stage of feasibility study.

但是這僅僅處于可行性研究的初期階段。

eg. Those initiatives are all in the early stages, and the dividends are not yet clear.

所有這些倡議目前都還處于早期階段，以后的回報(bào)還不可知。

3. graze on

吃（牛羊等吃草）

eg. There is good grassland here for your cattle and horses to graze on.

這里有良好的草場可供你的牛馬放牧。

eg. Small fish and invertebrates also graze on the plant-like organisms, and then those smaller animals are eaten by bigger ones.

小魚和無脊椎動(dòng)物也以這些植物類生物為食，然后則是眾所周知的小魚吃蝦米，大魚吃小魚。