一只大象的英文是 "an elephant"。这个词源自希腊语 "elephas"，意思是"大象"。一些例句如下：

"The elephant is the largest land animal in the world." (大象是世界上最大的陆地动物。)

"The elephant has a long trunk and large ears." (大象有一个长鼻子和大耳朵。)

"The elephant is known for its intelligence and social behavior." (大象以其智慧和社会行为而闻名。)