Once plaque has hardened into calculus (tartar), brushing can't remove it. If you think you might brush too hard, hold your toothbrush the same way you hold a pen.
如果你认为刷牙可能太用力，握你的牙刷就想握一支笔一样。
The guide way and all gears in the headstock are hardened and precision ground.
在车头的所有齿轮经过高频淬火及精密研磨。
The only way we can continue to wear fur is if we have hardened our hearts so that we can no longer feel the pain and suffering that went into our garment.
只有这样，我们可以继续穿皮草是，如果我们有更坚定了我们的心，使我们可以不再感到痛苦和苦难，到我们的服装了。
Induction hardened, precision ground V-way bed.
感应淬火，精密研磨V型方式的床。
At present, the bridge has been hardened, can ensure the construction of two-way 4 lanes and the rest of the 2 non motorized vehicles to facilitate public access from the bridge.
目前，桥下已进行了硬化，可保证施工时保留双向4车道与2个非机动车道，方便市民从桥下通行。
At present, the bridge has been hardened, can ensure the construction of two-way 4 lanes and the rest of the 2 non motorized vehicles to facilitate public access from the bridge.
目前，桥下已进行了硬化，可保证施工时保留双向4车道与2个非机动车道，方便市民从桥下通行。
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