1)impediment,n.妨碍，障碍物2)obstruction,n.妨碍,障碍物3)PLC,n￡4)N),N）5)N~+,N~+6)n))}seguence,n）}7)A(n),A（n）8)N+,N+9)a_n),a_n）10)content of nitrogen,N%
用法和例句
The effect of single and double strand breakage and its transforming activity of in vitro plasmid DN+A was analysised by 30Kev N++、Ar+ ion beam radiation respectively.
