Dr. tenoever and his team wanted to find out how the virus knows exactly how much time it needs to multiply and move on .
坦奈艾佛尔博士和他的团队,想查明病毒是怎样确切地知道需要化多少时间增殖和继续其生活史。
Exactly where the tipping point at which government bonds cease to be riskless is difficult to determine because it depends on prevailing misconceptions .