1.Opposition groups said it wasn't attempt by president Joseph Kabila to stay in power as he can not stand for reelction.
stand for 代表;支持;象征;担任…的候选人
The party is trying to give the impression that it alone stands for democracy.
该党正企图让人觉得只有它才代表民主。
I would like to see him stand for re-election.
我希望看到他竞选连任。
2.Mr. Nisman had accused several senior government figures with involvement of trying to cover up the bombing enquiry.
cover up 掩盖,盖住
He suspects there's a conspiracy to cover up the crime.
他怀疑有掩盖这桩罪行的阴谋。
They knew they had done something terribly wrong and lied to cover it up.
他们知道已犯下了大错,并撒谎来掩盖这一错误。