The first paper was made from the bark of the mulberry tree.
B
暂无解析
Some children display an unquenchable 难以抑制的 curiosity about every new thing they encounter.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野
Bats fly, rather than glide, and thus are the only mammals capable of true flight.