It is always optional to re-state any base interface in a partial class.
分布类中是否重新声明它所实现的接口也是可选的。
2
There should be no need now to re-state the problem, and we are still tackling with the same old problem albeit with a new breed of toxicity.
目前原本不需要重新提出这些问题，虽然我们我们仍在解决新一代毒性化学品造成的相同老问题。
3
Derived classes are not required to re-state that they implement an interface from their base class, but are permitted to do so. (This case is special; see below for more details.)