noun🔗Share蓝颜知己，好哥们。 An especially close and trusted friend.""I told my bf everything about my problems with my math class." "我把数学课遇到的所有问题都告诉了我的蓝颜知己了。personhumanfamilycharactercommunicationChat with AIVocabulary GamePractice Reading
noun🔗Share宝器，神器 An object or concept considered very useful or helpful."For a student struggling with math, a reliable calculator is a real bf. "对于一个在数学上挣扎的学生来说，一个靠谱的计算器简直是个神器。utilityaidthingassetvalueChat with AIVocabulary GamePractice Reading
noun🔗Share粗体，黑体字。 A font that is dark, having a high ratio of ink to white space, written or drawn with thick strong lines."The boldface (bf) in the textbook helped the students quickly find the key definitions. "课本里的粗体字(cūtǐzì)帮助学生们快速找到关键定义。typewritingstylecommunicationChat with AIVocabulary GamePractice Reading
noun🔗Share男朋友，男友。 A male partner in an unmarried romantic relationship.""Sarah's bf is helping her study for her math test." "萨拉的男友正在帮她复习数学考试。familypersonhumanChat with AIVocabulary GamePractice Reading
noun🔗Share男朋友, 男友 A male friend."Maria introduced her friend Tom, explaining, "He's just a bf from my English class." "玛丽亚介绍了她的朋友汤姆，解释说：“他只是我英语课上的一个男友。”personhumanfamilycommunicationChat with AIVocabulary GamePractice Reading
