To know something very well
非常熟悉某事 (feichang shuxi mǒu shi)
"She knows the syllabus inside out."
"她非常熟悉这门课程。" (ta feichang shuxi zhe men kecheng)
a significant improvement or shift
a person who helps others selflessly
to gradually move up to higher positions in an organization
to have a lot of energy and enthusiasm
to contact someone for help or communication
to accuse someone of being responsible for something bad.
