The natives used to hammer the metal into arrowheads using heavy stones.土著人以前總是用沉重的石頭把這種金屬錘打成箭頭.Arrowheads on the lines indicate the direction in which the taugent is to be drawn.電力線上的箭頭表示所要畫的切線方向.Bronze weapons: spears,...
馬鈴薯是塊莖植物.The potato is a tuber plant.由這類馬玲薯產(chǎn)生的塊莖中莖斑駁癥狀不易觀察到.In tubers from such potatoes stem mottle symptoms are rarely observed.芽長成新株,新株生出新的塊莖.The buds grow into new plants which produce new tubers....