这段山路因频繁的车祸事故而成为了著名的危险路段。

This mountain road has become a well-known ___blackspot due to frequent car accidents.

我的白衬衫上有个明显的黑点。

There's a noticeable ___black spot on my white shirt.

这个山谷是个信号盲区，我的手机完全没有信号。

This valley is a ___blackspot where my phone has no signal at all.