- 镭是谁发现的？
Who was radium discovered by?
- 那个发现纯属偶然。
That discovery was quite accidental.
- 我发现读这本书很难。
I find this book is very difficult to read.
- 谁发现了美洲？
Who discovered America?
- 他们早晚会发现的。
They will find out sooner or later.
- 他发现自己错了。
He saw that he was wrong.
- 我发现他在花园里干活。
I found him working in the garden.
- 他在行窃的时后被发现。
He was detected in the very act of stealing.
- 他碰巧发现了宝藏。
It happened that he found the treasure.
