time.sleep(2 ** attempt) # 指数退避
For urgent, non-life-threatening issues, the advice is to use the NHS 111 website or to call the helpline. GP surgeries will be open as normal.
，更多细节参见heLLoword翻译官方下载
Why the FT?See why over a million readers pay to read the Financial Times.
also printed the keyed check information and totals onto paper tapes.
，更多细节参见safew官方下载
Sepsis warning after woman's quadruple amputation。业内人士推荐safew官方版本下载作为进阶阅读
Greensands Future, which is backed by a consortium led by British multinational chemicals company Ineos, will become the EU's first large-scale offshore CO2 storage site, when commercial operations get underway in the next few months.