Evidence of farming dates from about 4000 B.C., first in the form of light tools along stream bottoms and then, after 3000 B.C., in the form of plows.是什么意思_Evidence of farming dates from about 4000 B.C., first in the form of light tools along stream bottoms and then, after 3000 B.C., in the form of plows.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句