蒸汽机是改善人类状况的最有力工具。
I was taught that the way of progress was neither swift nor easy.
学习阅读涉及注意力网络的发展,使儿童能够专注于字母和单词,同时忽略干扰。
The best leaders are those who know how to follow.
Just kick it with you and your best friend