bay 指海岸线上一大块凹入的地方，是港口的所在地。
gulf 一般比bay大，但比sea小。指大片深入到陆地中，由海岸围绕成半圆形的海水区域。
参考例句
1. I know every cape and bay on the coast of France and Italy. 法兰西和意大利海岸线上的每个海岬和港湾我都很熟悉。
2. When you walk down to the bay the ocean is dark blue and is really deep! 当你散步到海湾的时候你会发现海洋是深蓝色的，非常深的啊！
3. A city of southeast Texas at the head of Galveston Bay on the Houston Ship Channel. It is an oil-refining and industrial center. Population, 63, 850. 贝敦美国得克萨斯州东南一城市，位于休斯顿船道上的加尔维斯顿湾上方。是一个炼油和工业中心。人口63，850。
英英解释
n.
1. an indentation of a shoreline larger than a cove but smaller than a gulf
2. the sound of a hound on the scent
3. small Mediterranean evergreen tree with small blackish berries and glossy aromatic leaves used for f
4. a compartment on a ship between decks; often used as a hospital
5. a compartment in an aircraft used for some specific purpose
6. a small recess opening off a larger room
7. a horse of a moderate reddish-brown color v.
1. utter in deep prolonged tones
2. bark with prolonged noises, of dogs adj.
1. (used of animals especially a horse) of a moderate reddish-brown color
