Troubleproof
a. 不生故障的, 无故障的
🗣️ 情景例句
What type of visa have you got?
您持的是哪种签证？
I think it's going to be too hot.
我认为天气将会太热。
Mr Hu stood at the starting line. All the runners got ready to run.
胡先生站在起跑线上。所有的运动员都做好了起跑准备。