• 不(no; not; negation)

A bird flying swiftly upward and never willing to return represents the meaning of swift and unyielding.

• 之(walk; arrive; step on ground)

A footstep moving forward on the ground represents "go to," which then becomes a grammatical particle.

• ⼅(hook; fishhook)
• 口(mouth; speech)
• 彐(hand holding brush)

Using your hand to hold a brush and write down important spoken words from beginning to end is work.

• 不(no; not; negation)

A bird flying swiftly upward and never willing to return represents the meaning of swift and unyielding.

• 之(walk; arrive; step on ground)

A footstep moving forward on the ground represents "go to," which then becomes a grammatical particle.

• ⼅(hook; fishhook)
• 口(mouth; speech)
• 彐(hand holding brush)

Using your hand to hold a brush and write down important spoken words from beginning to end is work.