time.sleep(2 ** attempt) # 指数退避
他告訴 BBC：「吉絲蓮是主要聯絡人，確實是她讓我與克林頓總統的左右手道格・班德取得聯繫。」
。业内人士推荐51吃瓜作为进阶阅读
The challenge of developing a robust, dexterous and affordable hand was underlined by Tesla-boss Elon Musk, when he spoke at the All-In Summit in Los Angeles in September of last year.
A few months ago, for instance, I watched my mother-in-law (who was born and raised in a village in northern Iran) teach Nava how to knock on wood for good luck. I hadn’t realized this was so widespread a practice until I checked Wikipedia and found that variants exist in Bulgaria (chukam na dǎrvo), Georgia (kheze daḳaḳuneba), Indonesia (amit-amit jabang bayi), Norway (bank i bordet ) and some two dozen other countries.
Some of these congates are cognate with only part of the word.