Full of self possession, he calmly wore his way through the rock with a steady succession of light and skilful strokes, working through an aperture six inches wide at the outside.
他充满自制力， 平静地穿过岩石， 用一连串轻柔而熟练的笔触，穿过外部六英寸宽的缝隙。
Stroke work
原声例句
地心游记-The journey to the heart of the Earth
英语百科
Stroke volume
（重定向自Stroke work）
![Major factors influencing stroke volume – Multiple factors impact preload, afterload, and contractility, and are the major considerations influencing SV.[7]](/uploads/202502/13/2035_Factors_in_Stroke_Volume5702.jpg)
In cardiovascular physiology, stroke volume (SV) is the volume of blood pumped from the left ventricle per beat. Stroke volume is calculated using measurements of ventricle volumes from an echocardiogram and subtracting the volume of the blood in the ventricle at the end of a beat (called end-systolic volume) from the volume of blood just prior to the beat (called end-diastolic volume). The term stroke volume can apply to each of the two ventricles of the heart, although it usually refers to the left ventricle. The stroke volumes for each ventricle are generally equal, both being approximately 70 mL in a healthy 70-kg man.
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