Xtra
n. [电讯]字母X
🗣️ 情景例句
It sets the tone for the whole show.
它决定了整个展览的气氛。
I don't feel up to going to work today.
我今天不舒服，不能上班。
they can locate and steer clear of obstacles -- or locate flying insects on which they feed.
并能通过回声来确定并躲开障碍物，或找到它们赖以为生的昆虫。