The merger looks great on paper, but the rub is the overseas tax rules.

這項合併案在書面上看起來很棒，但難題在於海外的稅務規定。

We can ship the order by Friday; the rub is finding enough trucks.

我們能在週五前出貨，麻煩的是要找到足夠的卡車。

The candidate is ideal, and the only rub is her required relocation date.

這位應徵者很理想，唯一的障礙是她要求的搬遷日期。