Upgradeability
n. 可升级性；升级功能
🗣️ 情景例句
Will you be my fiancée?
你想成为我的未婚妻吗？
The morning sun never lasts a day.
好景不常。
Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.
如果有相配的电压，可以煮少量水的便携式热水装置是有用的。