變厚的動脈壁使流通血液的管腔變細(xì).The thickened artery wall narrows the channel through which the blood flows.那支旗竿逐漸變細(xì)成尖頭.The flagpole tapered off to a point.向上變細(xì)的水道可以出現(xiàn)在好多種環(huán)境中, 從海底峽谷到?jīng)_積扇.Upward - fining channels may occur in a wide rang...