铆 ㄇㄠ ˇ mǎo 劲 ㄐㄧㄣ ˋ jìn 儿 ㄦ・ r 鉚 ㄇㄠ ˇ mǎo 勁 ㄐㄧㄣ ˋ jìn 兒 ㄦ・ r to apply all one's strength in a burst of effort