1.It lets you shop as normal and then scans what you have bought as you leave the store.
as normal正常
He wasn't quite as perky as normal.
他并不像往常那么高興 。
2.There is no waiting in line, no cashiers, and no being held up by slow customers, credit card transactions or waiting for change.
hold up耽擱
Continuing violence could hold up progress towards reform.
持續的暴力活動可能會阻延改革的進程 。
3.The grocery and convenience store markets are extremely tough nuts to crack.
tough nuts to crack難處理的事物
Cultural aspects are always tough nuts to crack in translation, especially in drama translation.
牽涉文化層面的翻譯往往比較棘手,尤其是在話劇翻譯中 。