I'm up to Lesson Eight.

我已读到第八课。

youdao

And eight years later Nixon seemed to have learned his lesson.

而八年后尼克松似乎也学到了教训

耶鲁公开课 - 博弈论课程节选

Seems like a simple lesson (the first few years of your career constitute an eight-hour-a-day test, FYI), but the hilariously haughty and utterly off-base email from a former lifeguard to his old boss published by Deadspin shows that not all young ladder climbers have grasped this logic.

FORBES: The One Thing You Should Never Bring To Work

Clapping and singing echo across the central courtyard, as a teacher leads a group of doll-like eight- and nine-yearold girls in a dance lesson.

BBC: High spirits in Bali

Aimed at children between the ages of eight and 12, the projects inside each package teach a basic lesson in science, technology, engineering or math through a hands-on experience.

ENGADGET