“背部挺直”例句

单词 背部挺直 例句 DEFINITIVE EXAMPLES 权威例句〔backwards〕Keeping your back straight, swing one leg backwards.背部挺直, 一条腿向后甩。外研社新世纪〔bend〕Bend your knees, keeping your back straight.膝盖弯曲，背部挺直。牛津高阶〔expanse〕He held erect t...