Most people think that gaining muscle mass and tone takes months of hard work.
大多数人认为，增大肌肉块和增加肌肉弹性需要月复一月的艰苦锻炼。
It's hard to imagine sticking Grandma in a centrifuge to protect her muscle mass.
很难想象把老奶奶绑在离心机上保持肌肉会是什么情形。
It's hard to control fear when a mass hysteria strikes.
群众大恐慌发作起来确实难以控制。
It is not hard to see why normal stars should be limited in mass.
要弄懂普通恒星的质量为什么要受到限制并不难。
It is not hard to see why normal stars should be limited in mass.
要弄懂普通恒星的质量为什么要受到限制并不难。
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