不好用

你试试 要是 不好用 还疼的话 就赶紧去医院

(跑船从国外带回来的) ── Previous context

“Give it a try. If it doesn't work and it still hurts, go to the hospital right away.”

我发动机 不好用 你也知道

(就当是帮我一个小忙了) ── Previous context

“You know my engine isn't working well?”

高原缺氧 脑子 不好用

(等会儿啊) ── Previous context

“High altitude slows my brain.”