美国海军放宽女性官兵的发型限制

ponytail – n. way of arranging hair by gathering it together at the back of the head and letting it hang down freely

hairstyle – n. a way in which someone's hair is cut or organized

strand – n. a thin piece of hair

bun – n. way of wearing long hair by twisting it into a round shape at the sides or back of the head

helmet – n. a hard hat worn to protect your head

update – v. add new information

antiquated – adj. very old, not modern