专心最重要的是把心灵的全部力量集中于当前正在从事的工作上面. The highest principle or essence which can not be explained in words
言语道断 But in essence the struggle against bourgeois liberalization is a long-term task.
但从根本上说,这是一个长期的事. The essence for him is not the warm handclasp and the smiling photograph
对于他,重要的不是热烈的握手和微笑的照片.