21-05-13 口语表达 knuckle down 的意思是 开始努力做某项任务，比如 开始用功学习或辛勤工作。有人认为该说法源于弹球游戏，这是因为游戏中参与者通常会把 knuckles 指关节 贴在地面上，把弹子放在食指关节间，然后用大拇指把球弹出去。 例句 You need to knuckle down if you...

15-05-04 It creates a sound that sets teeth on edge and, we're often told, raises the risk of arthritis. But people who can crack their knuckles may actually have healthier joints than others. 掰指关节的声音让人很不舒服，而且我们常被告知，掰指关节会增加患关...

15-04-16 Pull my finger, a phrase embraced by school-aged kids and embarrassing uncles the world over, is now being used to settle a decades-long debate about what happens when you crack your knuckles. In a new study published April 15 in PLOS ONE, an intern...