保持垂直姿势，但不要过于刻意。
Keep your posture erect but not overly posed. Think “Greek Statue,” not “William Shatner.”
于此同时，我们的直立姿势使得气管和食管出于一个近乎垂直的位置。
Simultaneously, our upright posture put the trachea and esophagus in a near-vertical orientation.
大猩猩迈步时，前臂和手腕垂直向下，有固定的、凯威尔称之为‘圆柱状’姿势，类似于大象走路。
Gorillas stride with their arms and wrists extended straight down and locked in what Kivell called 'columnar' stances that resemble how elephants walk.
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