Using hydraulic supports in heavy grade longwall face with sublevel caving, anti-topple and antiskid are the key factors.

在大倾角倾斜煤层进行综放开采，支架的防倒、防滑成为决定放顶煤开采成功与否的关键。

youdao

On Saturday President Suslio Bambang Yudhoyono was critical of some anti-corruption activists, saying they are politically motivated and want only to discredit and topple his presidency.

VOA: standard.2009.12.10

And the venue is historically significant - 40 years ago Mr Mandela was jailed for life in the same courtroom for conspiracy to topple the government, along with other anti-apartheid activists.

BBC: South African treason trial starts