Riskless
a. 无危险的
✅ 同义词
🗣️ 情景例句
It's a nap. Tomorrow morning at ten o'clock.
简单得很。明早十点。
I ask him to tell me everything he knew.
我要求他告诉我，他所知道的每件事情。
In his twenties Frank used to make spare parts for aeroplanes.
20多岁的时候，弗兰克曾生产飞机零配件。