“shrill whistle”簡單造句，shrill whistle造句子

Suddenly Heidi, hearing a shrill whistle, rushed outside, as peter and all his goats came racing down.

Two strong shrill whistles answered through the calm.

For us, the slothful spell was broken on our second afternoon by a shrill whistle.

The grandfather stood under the door, watching her, when suddenly a shrill whistle was heard.