Treacherous: 变化莫测的

5月30日上午，2005年珠峰登顶测量队和中国女子登山队的至少30名队员成功突破了恶劣天气的限制，花费7小时38分钟登上了世界之巅珠穆朗玛峰，并在峰顶停留77分钟。据悉，他们是今年珠峰攀登季节的第一支登顶队伍。外电报道如下：At least 30 climbers scaled Mount Everest on Monday, exploiting a break in treacherous¹ weather to reach the world's highest peak, officials said.

They were the first to reach the 8,850-meter summit from the Nepalese side during this year's climbing season, which ends Tuesday, said Rajendra Pandey, a Mountaineering Department official.

At least two climbers have died in previous attempts this year, as strong winds and snowstorms have made climbing conditions miserable², forcing climbers to remain at the base camp for weeks.

Treacherous表示“变化莫测的；危险的或欺骗性的”，例如：treacherous waters（充满危险的水域）；treacherous weather（变化莫测的天气）；treacherous ice（看起来坚固而踏上去会破裂的冰）；a treacherous action（背叛行为）。