例句與造句

1. This event happened recently as there is only one major allele and minor alleles are at trace frequencies.
2. Outside Europe, haplogroup W is also found at high frequencies among the Tajiks ( 6.2 % ), around 1.5 % among the Uzbeks, Turkmens and Kazakhs, and at trace frequencies ( < 0.5 % ) among many North Asian ethnic groups ( Tuva, Yakuts, Buryats, Mongolians, Koreans, Japanese ).
3. It's difficult to find tracing frequency in a sentence. 用tracing frequency造句挺難的