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汉语拼音：yìng dù

1.固体坚硬的程度，即矿物或材料抵抗其他物体刻划或压入其表面的能力。测定矿物硬度的莫氏硬度分10级，硬度由1至10（由软至硬）的十种标准矿物依次是滑石、石膏、方解石、萤石、磷灰石、正长石、石英、黄玉、刚玉、金刚石。

2.指水的硬度。是水质指标之一，其值为水中钙镁等溶解盐类的总量。用毫克当量浓度表示。在工业上水的硬度有多种表示方法，如通用的德国度，1度相当于1升水中含氧化钙（CaO）10毫克。

1. 固体坚硬的程度。如：金刚石的硬度是10，是已知的最硬物质。

2. 用以形容说话的声音和语气等高低徐疾的程度。

   悄吟 《桥》：“我和她谈话的声音，被零度以下的气温所反应，也增加了硬度。”

• The softer rock wears away.

  硬度较低的石头磨光滑了。

• With regard to hardness, the diamond is in a class by itself.

  讲硬度, 金刚钻是独一无二的.

• Lead is one of the softer metals.

  铅是硬度较低的金属之一.

• The amount of force needed is inversely proportional to the rigidity of the material.

  需要的力度与材料的硬度成反比.

• The temperature, well below freezing, made our voices crisper than usual.

  我和她谈话的声音, 被零度以下的气温所反应也增加了硬度.

• This scale is based on the relative abrasiveness of minerals.

  此硬度计的依据是矿物的相对研磨能力.

• One simple way of describing strength is in terms of surface hardness.

  描述强度的一种最简单方法是以表面硬度来表示.

• The temper of steel is higher than that of aluminium.

  钢的硬度比铝高.

• Indentation methods of hardness testing comprise two principal groups.

  压痕法测定硬度包括两大类.

• Hardness is caused by divalent metallic cations.

  硬度是由一些两价金属阳离子引起的.

• Antimony adds to the rigidity of the casting.

  锑能增加铸件的硬度.

• This process removes the water hardness.

  这一工艺去除水的硬度.

• The hydrogenation can be controlled to produce any degree of hardness desired in the product.

  为了生产所需要的任何硬度的产品,可对氢作用加以控制.

• Silicon is a hard, brittle material registering 72.6 on the Rockwell " A " hardness scale.

  硅是硬而脆的材料,根据Rockwell “ A” ” 硬度分度测值为72.6.

• A certain degree of stem solidness results in damaged and desiccated eggs and impaired larval movements.

  一定的茎秆硬度会致使虫卵损伤和脱水,削移幼虫的移动.