a thin triangular flap of a heart valve
同义词：cusp
part of a compound leaf
a small book usually having a paper cover
同义词：booklet??/??brochure??/??folder??/??pamphlet
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。