短语词组短语thin -out 尖灭thin out the crude 降低原油粘度crown thin out 疏剪树冠thin out maize seedlings 间玉米苗thin out the seedlings 间苗thin out seedling 按一定的株距留下作物的幼苗thin out trap 尖灭圈闭thin out millet seedlings 间谷子苗thin out of coal seam 煤层尖灭 返回 thin out