Underaging
时效不足
🗣️ 情景例句
A credit card is very useful when you go traveling.
当然旅游的时候，信用卡很有用。
What a beautiful garden you have!
你的花园真漂亮。
Though these large machines still exist, many of their functions have been taken over by small powerful personal computers, commonly known as PCs.
虽然这种大计算机仍然存在，但它们的许多功能已被体积小但功能齐全的个人电脑——即我们常说的PC机——所代替了。