1.The contract was declared null and void.

1.合同被宣布无效。

2.The general event horizon formula of black hole is given from null hypersurface equation.

2.面方程出发,出了黑洞视界面的遍公式.

3.Drum machine changes would result in a null at the punner in an intermediate state.

3.卷筒推力的保持兵会满转轮在洋间状况处单程摆动。