永久齿

From a preventive and interceptive viewpoint, when a child's dentition is a Class I relationship before the primary second molars are lost, so that the space derived from mesial drift and diastemata is available, it is likely that emerging permanent teeth will assume correct alignment.

由预防性与阻断性的观点而言，当小病人在第二乳臼齿脱落之前的齿列是一级咬合关系时，如此空间可由近心倾斜门齿间隙所获得，而将来的永久齿是可得一正确的排列。

If other people in the picture are genuinely smiling, prepare for your frozen-faced grin to be immortalized.

如果照片中的其他人都率真地微笑着，你的那张刻板脸最好也能露齿而笑，让人永久回味。

Scientists have traced this behavior to hormones in the rodent's brain, which triggers lasting bond formation and increased aggression toward potential home wreckers

科学家们曾经追踪啮齿动物脑中的荷尔蒙，来解释它们的这种行为：触发它们永久结合的形成物和对潜在家庭毁灭者的攻击。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。