✅ 同义词
🗣️ 情景例句
I always wanted to travel to Europe but I was afraid that language would be a problem.
我总想去欧洲旅游，但我又怕语言是个问题。
Opportunity only knocks once.
机不可失，时不再来。
Later it crossed the Channel, riding smoothly over the waves, which presented no problem.
后来气垫船跨越英吉利海峡，平稳地在波浪上方行驶，波浪不再产生阻力。