It's a lot harder to hit a moving target than I thought.

要击中移动目标的难度比我想象中大得多。

It's really hard to hit a target if it's always moving!

如果目标不确定的话，实现目标真的很难！

We talked about before and it's harder to hit a target with this slower type of design.

我们之前讨论过，这种较慢的设计很难达到目标。

Now the only problem is it's really hard to hit small targets with a dart  that small.

现在唯一的问题是用这么小的飞镖很难击中小目标。