自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
N-COUNT (尤指伤亡惨重的)灾难，灾祸(如地震、坠机等) A disaster is a very bad accident such as an earthquake or a plane crash, especially one in which a lot of people are killed.
It was the second air disaster in the region in less than two months...
Many had lost all in the disaster and were destitute.
N-COUNT 非常糟糕的事;彻底的失败;不幸 If you refer to something as a disaster, you are emphasizing that you think it is extremely bad or unacceptable.
The whole production was just a disaster!
It would be a disaster for them not to reach the semi-finals...
N-UNCOUNT 灾祸;祸患 Disaster is something which has very bad consequences for you.
The government brought itself to the brink of fiscal disaster...
'The potential for disaster is enormous,' he says.
PHRASE 没有什么好结果；后患无穷 If you say that something is a recipe for disaster, you mean that it is very likely to have unpleasant consequences.