HSK C5/W3
Correct

/ gāng /
Strokes

Definition

head rope of a fishing net/guiding principle/key link/class (taxonomy)/outline/program

Example

As a Noun
headrope of a fishing net
As a Noun
key link; guiding principle; outline; programme
As a Noun
class
As a Noun
organization for transporting certain goods in large quantities under convoy