Examples
tā他wèi néng未能zūn shǒu遵守jiāo tōng交通guī规zé则，jié结guǒ果fā发shēng生le了yán严zhòng重de的shì gù事故。
他未能遵守交通规则，结果发生了严重的事故。
His failure to observe traffic regulations resulted in a serious accident.
他们俩都未能找到我们的星球所面临最严重的问题。
They have both failed to find the most serious problem that has ever faced our planet.