You should not deliberately firm your abdomen, although it does retain a degree of firmness naturally from the uplifting action in your torso.
你不能使腹部僵硬，尽管腹部在躯干向上时要保持一定程度的自然收紧。
Examine the firmness and color of fresh pears. Being firm to touch is one of the many indicators of freshness.
查看梨的硬度和颜色。摸起来硬说明它可能是新鲜的。
Regular use improves elasticity and firmness, reducing the appearance of fine lines and age spots, so skin looks firm and radiant.
定期使用，可改善肌肤弹性，变得更加紧致，并淡化幼纹和色斑，令肌肤光采再现。
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