Keep your front shin vertical, back knee straight, back heel lifted, and chest lifted.

保持前面小腿垂直地板，后膝伸直，后脚跟离地，胸腔上展。

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Lifts: Seated in a chair with your back straight and your feet on the floor, squeeze knees together and gently bring them toward your chest.

举腿：在椅子上坐直，脚放在地板上，然后把膝盖弯曲尽力向胸靠拢。

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Echocardiography of 91 cases of flat chest (straight back) syndrome were reported.

报告91例扁平胸(直背)综合征患者心脏经超声心动图检查。

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Soon after, a Liam Craig volley went straight into the chest of Jaakkola and the Finnish keeper was forced to tip away a Dave Mackay free-kick with only 13 minutes gone.

BBC: Sport - Football - St Johnstone 0-0 Kilmarnock

She was leaning right over him, looking straight down at his chest.

NEWYORKER: The Dog

The Rockets played without starting point guard Jeremy Lin for the second straight game because of a bruised chest muscle.

NPR: Harden Powers Past Illness, Lifts Rockets 107-100