Upgradability
n. 可升级性；升格能力；提升能力
🗣️ 情景例句
He's so little ... so new.
他这么小……这么幼……
Who is this?I don't recognize your voice.
你是谁？我听不出你的声音。
The weather was very cold, and many people were ill.
天气非常冷，很多人生了病。