词汇网络: twitching

Anxiety is a feeling of worry, nervousness, or unease about something with an uncertain outcome. It is a common emotion that people feel when they are stressed or afraid of what might happen in the future.

A bundle of fibers in the body that transmits impulses of sensation to the brain or spinal cord. Metaphorically, it refers to courage, mental fortitude, or sometimes impudent boldness.

A muscle is a piece of body tissue that you tighten and relax to produce movement. It is the part of your body that gives you strength and allows your arms and legs to move.