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。
Firmness of jam berries correlated negatively with firmness of jam media, i. e. jams with firmer strawberries had less firm medium.
浆果果酱果酱硬度与媒体相关的坚定性负，即以更坚定的草莓果酱少了坚定的媒介。
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