lowing什么意思？

The cattle are lowing in the barn.牛在牲口棚里哞哞叫。Finally he started slowly, the wagon creaking and the cow lowing mournfully at every step.马终于慢吞吞地挪动了四蹄, 车轮吱吱嘎嘎地滚动,母牛跟在后面一步一声哀叫.Then why do my ears ring with the lowing of oxen ...

lowing的音标：lowing的英式发音音标为：['ləʊɪŋ]lowing的美式发音音标为：['loʊɪŋ]...