People are often nervous or apprehensive before performing in front of an audience.忧虑的; 有理解力的; 惶惑;

People who are really nervous may feel tense, which is the opposite of relaxed.

(Sometimes, taking a deep breath can help a nervous person feel more relaxed.)

(When someone is nervous their muscles often tense up and their heart rate increases.)

Someone who strongly believes in their ability to do something is often confident.

The best way to build confidence is to practice what you are going to do until you can do it with ease.

(The key to building confidence and reducing nervousness is effective and frequent practice.)

To be indifferent means to not care one way or the other about something.

If you are indifferent to a person or a project, it means that the person or project isn't important to you.

(People who are indifferent may not value anything or anyone but themselves.)

To be appreciative is to be thankful or grateful for something.

If someone does something nice for you, you should appreciate it.

(It's important to show your appreciation for someone's support or help.)

To be depressed is the opposite of to be happy.

When someone is depressed, they feel very sad.

(When people are depressed, they are usually pessimistic about the future.)悲观的，厌世的

(Depression can be caused by disappointing news or by failing to reach a goal.)

Someone who has practiced a lot and believes in his or her ability is? -confident