In order for string theory to work properly, it has to have these extra space dimensions.

为了使弦理论正常工作，它必须有这些额外的空间维度。

There would also be problems with more than three space dimensions.

超过三个空间维度也会有问题。

Two space dimensions do not seem to be enough to allow for the development of complicated beings like us.

两个空间维度似乎不足以让像我们这样的复杂生物得以发展。

By saying that particles are not made out of points to make a little bits of string, but it turns out that those theories only usually work if there are not three space dimensions.

粒子不是由点组成的，不是由弦组成的，但事实证明，这些理论只有在没有三维空间的情况下才成立。

In fact, the same behavior of gravity with distance in more than three space dimensions means that the sun would not be able to exist in a stable state with pressure balancing gravity.

事实上，在超过三个空间维度中，重力与距离的相同行为意味着太阳将无法以压力平衡重力的稳定状态存在。