英语翻译And even if a business doesnt have a sign or advertiseme

即使一家企业没有挂告示或打广告来表明他们正在聘用人,停下来问一下经理.你即管填写份入职申请,反正这可能会导致在未来能找一份差事.
~~~~~~~~~纯人手翻译,欢迎采纳~~~~~~~~~
原文有笔误,应作如下：
And even if a business doesn't have a sign or advertisement indicating that they are looking for help, stop by and ask a manager. You might fill in an application anyway which could lead to a position in the future.

1、not a single没有一个，that might have indicated that the pebbles came from the nearby continent是修饰pebble的定语从句~~
2、可以借用not...until句型来翻译。Many scholars didn't believe that...until the late 1970s.中didn't...

如果一家公司没有商标和广告，那就说明他们停止找人或需要一名经理。不管怎样你可以先填写职位申请表，或许以后会有有适合你的职位。
P.S.: looking for helpstop by and ask a manager这里我也不太确定