Wǒmen / zuìhǎo / héshí / dì / èr / shǒu / zīliào / zài / juédìng / shìfǒu / cǎiyòng / zhège / jiélùn我们最好核实第二手资料,再决定是否采用这个结论。We should verify the secondhand sources before deciding whether to accept this conclusion.