He became the greatest inventor of contemporary times because of his focus on his goal and tirelessness.

他之所以能成為當(dāng)代最偉大的發(fā)明家黄色网站无码在线免费播放，實(shí)得力于他的專心致志，努力不懈开心五月丁香婷婷国产在线A片。

We must have the spirit of not getting tired of learning and of showing tirelessness in helping others to learn.

我們要有學(xué)而不厭美国无码精品，誨人不倦的精神。