external device的用法和樣例：
例句
- Before Mr Larsson received his implantable device, patients had received pacing from huge external devices.
在拉森之前的很多病人通過(guò)巨大的外部設備調節心律。 - A mouse is essentially a pointing device that allows the user to do many operations more quickly than he could with the keyboard alone.
鼠標是一個(gè)必要的外部設備，它可以使用戶(hù)以比僅使用鍵盤(pán)快得多的速度完成許多操作。
