Choose the best answer: 
Electrolux introduced the Trilobite in 2001. Since then, the company has made 200 improvements to the vacuum, which relies on an ultrasound system to navigate around objects as it cleans.

Suy nghĩ và trả lời câu hỏi trước khi xem đáp án

ATNETWORK
ADMICRO
YOMEDIA
ZUNIA9