英语语法分析

In summary, amino acids are easy to make, nucleotides can be made with considerable difficulty, and other biologically important small molecules can be synthesized “abiotically”.

总之，氨基酸是很容易制造的，核苷酸也是可以制造的，但是有相当的难度，其他重要的生物小分子也可以被"无生命地"合成出来。