It's hard to tell apart these two boys at first sight, aren't they?

第一眼看上去很难将这两个男孩区分开 不是吗

The two sides can be hard to tell apart.

双方可能很难分辨。

Investment and speculation is hard to tell apart.

投机与投资有时很难分辨。

From the beginning, the two were hard to tell apart.

从最开始，这两个学位便很难区分。

Male and female crocodilians can be hard to tell apart visually.

男性和女性鳄鱼可能很难分辨视觉。

Even when magnified, the two organisms are difficult to tell apart.

即使放大之后，这两种有机体也难以区分。