质量的第一条规则是它必须被定义。
The first rule of quality is that it must be defined.
出自《魏源集·魏源诗文》。万种感情交集在这(与林则徐见面)苍茫的一天,朋友相逢竟然一句话也说不出来。
Coal enterprises must enhance their sense of social responsibility and achieve the unity of economic and social benefits.