crawling on hands and knees
用手和膝盖爬行 (yòng shǒu hé xīgài páchíng)
"The baby moved on all fours across the floor."
"宝宝四肢着地在地板上爬行。" (bǎobǎo **sìzhī zhuòdì** zài dìbǎn shàng páchíng)
a very clever or intelligent person
the skill of doing something well
A work of outstanding artistry or craftsmanship.
The most important part of the economy.
it's not difficult to understand
to start a new hobby or leisure activity
