马铃薯是块茎植物.The potato is a tuber plant.由这类马玲薯产生的块茎中茎斑驳症状不易观察到.In tubers from such potatoes stem mottle symptoms are rarely observed.芽长成新株,新株生出新的块茎.The buds grow into new plants which produce new tubers....
The natives used to hammer the metal into arrowheads using heavy stones.土著人以前总是用沉重的石头把这种金属锤打成箭头.Arrowheads on the lines indicate the direction in which the taugent is to be drawn.电力线上的箭头表示所要画的切线方向.Bronze weapons: spears,...