对幼儿来说，妈妈的声音是具有特殊意义的参照物。

The leather industry must evolve to meet both environmental standards and consumer expectations without compromising quality.

I don't have to prove anything to anyone. There's nothing to prove.

没有人知道，也永远不会知道关于神和我所说的一切的真相；因为即使有人偶然说出了完整的真相，他也不知道；但表象覆盖了一切事物。