Although it is easy to model mathematically, making the system in the lab is tricky because it starts without any enzymes or templates to help the monomers assemble.

虽然它很容易用数学来建模，但在实验室里实现这个系统则让人颇费思量，因为里面缺乏了能帮助组装单体的酶和模板。

youdao

“Some of my friends can’t take these internships and spend a summer without making any money because they have to help pay for their own tuition or help their families with finances, ” she said.

她补充道：“我有些朋友无法参与这样的实习，因为白干一个暑假让他们没钱支付学费或帮称家里的开销。

youdao