The extremity of something is its furthest end or edge.
例句
...a small port on the north-western extremity of the Iberian peninsula.伊比利亞半島西北端的小港口...the extremities of the aeroplane.飛機(jī)的末端
N-PLURAL
（身體的）末端，末梢;（尤指）手腳
Your extremities are the end parts of your body, especially your hands and feet.
例句
He found that his extremities grew cold...他發(fā)現(xiàn)手腳變冷了。Exercise is very important as it keeps the circulation moving and warms the extremities.鍛煉非常重要，它可以促進(jìn)血液循環(huán)，保持手腳溫暖。
N-UNCOUNT
極度;極端
The extremity of a situation or of someone's behaviour is the degree to which it is severe, unusual, or unacceptable.
例句
In spite of the extremity of her seclusion she was sane...盡管完全與世隔絕，她依然心智健全。In the past, the region had been protected by its forbidding geography and the extremities of its climate...過去，這個(gè)地區(qū)令人生畏的地理?xiàng)l件和極端的天氣狀況使它受到保護(hù)。