در این جمله یعنی چه let alone where they were going

Question

Then a thick white fog came down, so they could hardly see the oars in their hands, let alone where they were going

Answer 1

سپس مه غلیظ و سفیدی به پایین آمد و آنها حتی نمیتوانستند پاروهایی که در دست داشتند را ببیند چه برسد به راهی که داشتند طی میکردند.