用drop造句现在进行时

The red river may be reaching its crest，lower than previously thought，just under 41 feet and dropping.

红河水位可能达到它的顶峰，比预期的要低，在41英尺以下并且还在下降.

Yellow dust was dropping from the limetrees .

菩提树枝头飘下黄色的花粉。