1 . 当科学家

but when scientist scientists and engineers then at detail design , they realized realised it would actually cost nearly double vanetthat .但是当科学家和工程师们仔细的看了设计之后，他们意识到实际上它需要将近两倍的钱。

1 . 科学家不

but the new vaccine contains an antibiotic resistant antibiotic-resistant gene that the scientist scientists do not want to release released into the enviornmentenvironment .但是新的疫苗含有一种抗生素抗性基因，科学家不想让其释放到环境中去。

1 . 科学家已经知道

but here is something that scientist scientists now know : a team led by professor Professor Fu has reported the first genetic link to how much sleep we need .但是现在科学家已经知道一些关于睡眠：一个由傅教授领导的团队已经首次报告了人们需要多少睡眠与基因的联系。

1 . 科学家已经

but here is something that scientist scientists now know : a team led by professor Professor Fu has reported the first genetic link to how much sleep we need .但是现在科学家已经知道一些关于睡眠：一个由傅教授领导的团队已经首次报告了人们需要多少睡眠与基因的联系。