by design的意思是：故意的。
双语例句：
1.It was hard to know whether it happened by accident or by design.
很难知道这是偶然发生还是有意为之。
2.The video challenge does not put individual students on the hot seat—so it's less intimidating by design.
视频挑战并没有把个别学生置于尴尬的境地——因此它在设计上不那么令人生畏。
3.Since we decide by design or accident to bring children into the world, with that comes the duty to care for them.
既然我们有意或无意的决定让孩子来到这个世界，那我们就有义务照顾他们。
4.And most of them, by design.
而且大部分都是被设计出来的。
5.This is not an accident, but rather, by design.
但这不是偶然，而是精心设计的结果。
