The two myosin heavy chains are important components of the contractile apparatus of the cardiomyocyte46.

两个肌球蛋白重链是心肌细胞的收缩装置的重要组分。

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The fiber types are defined by which "myosin heavy chains" (MHCs) they contain and by their metabolic capacity, a feature largely determined by the number of energy-producing mitochondria they house.

纤维类型取决于它们所含的肌球蛋白重链和它们的代谢能力，其所含产能线粒体的数量大大决定了其特征。

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All wore heavy chains on their arms and legs.

VOA: special.2010.01.07

It is a three-legged race with the runners struggling to go their own sweet way, while bound together by heavy chains.

BBC: Four more years of what?

But the image of so-called new Russians wearing heavy gold chains to the supermarket is changing.

NPR: Russian Oil Boom Fuels Rise of the Super-Rich

His handwritten field notes show street by street calculations in "chain lengths, " a painstaking process that used metal chains and heavy brass compasses, theodolytes and geodesic transits to reconcile the difference between true north and magnetic north readings.

WSJ: The Greatest Grid | Museum of the City of New York | Crosshatching a Miracle | By Ada Louise Huxtable