English中文EspañolFrançais
test button /ˈtɛst ˈbʌtən/ n

中文：测试按钮

中文 · 测试按钮Español · botón de ensayoFrançais · bouton d’essai
Meaning：Device that is pressed to determine whether the sound signal is functioning.
▶ Start interactive picture-tap lesson

Found in these illustrated scenes（1）

Smoke Detector

‹ Browse all scenes