Shrill sound is a high-piich sound and a soft sound is a low-pitch sound.

Explanation

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The question states that "shrill sound is a high-pitch sound" and "soft sound is a low-pitch sound."
- First, we need to understand what "shrill," "soft," "high-pitch," and "low-pitch" mean in the context of sound.

2. **Defining Pitch**:
- Pitch refers to the perceived frequency of a sound. It indicates how high or low a sound is.
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