Cut your teeth

Cut teeth：小孩长牙，也就是乳牙从牙床中冒出来

cut (one's) teeth on (something) ：获得初体验，开始尝试某事

To gain experience with something, especially at a young age (when one's teeth would be coming in).

Oh, I cut my teeth on those kinds of equations! Give me a challenging problem for a change!

Jen may be young, but she cut her teeth on academic writing, so her perspective and expertise will be invaluable to us.

cut teeth[for a baby or young person] to have new teeth emerging through the gums.

Billy is cranky because he's cutting teeth.

Ann cut her first tooth this week.

equations - 方程式，等式

invaluable - 无价的，非常宝贵的

gums - 牙龈，牙床

cranky - 暴燥的，古怪的