Unefficient
无效的, 效率不高的
🗣️ 情景例句
Your car's very noisy. The muffler must be damaged.
你的车噪音真大，消声器一定出毛病了。
I'm afraid all my efforts were in vain.
我担心我的努力全白费了。
Haven't you met yet?
你们还没见面吗？