我坚持自己的信仰，绝不退缩。

Innovation in leather tanning isn't just about new chemicals; it's about rethinking the entire lifecycle of the material.

Stepchildren are at greater risk because evolutionary pressures have shaped parental psychology to favor genetic offspring.

试图在不激发学生学习欲望的情况下进行教学的老师，就像在冷铁上敲打。