When someone arrives at a place, you can talk about their arrival there. This is rather formal use.
His arrival was hardly noticed.
A week after her arrival, we had a General School Meeting.
If you want to say that something happens immediately after someone arrives at a place, you can use a phrase beginning with on. Note that you must use on, not 'at', in sentences, like these. You do not say, for example, 'At his arrival in London, he went straight to Oxford Street. You can say 'On his arrival in London, he went straight to Oxford Street'.
On his arrival in Singapore he hired a secretary and rented his first office.
The British Council will book temporary hotel accommodation on your arrival in London.
The possessive determiner is often omitted. For example, instead of saying 'on their arrival', you can just say on arrival.
The principal guests were greeted on arrival by the Lord Mayor of London.
On arrival at the Station hotel in Dumfries he acknowledges a few familiar faces.
arr1-22x2xnx1 是一个数组表示形式，其中的数字代表数组的维度大小。arr1表示这是第一个数组，22表示第一维大小为22，2表示第二维大小为2，n表示第三维大小为n，1表示第四维大小为1。这种表示方法经常在编程中使用，特别是在机器学习和数据科学领域。使用它可以更直观地了解数据的形状和大小。在实际应用中，我们可以根据数据的维度大小，使用适当的算法和工具对数据进行处理和分析，从而提高模型的准确性和效率。
arrive at表示“到达某地点”时,往往指到达较小的地点。接名词或代词作宾语。也可接以形容词充当补足语的复合宾语。例句：The delegation is scheduled to arrive tomorrow。代表团定于明日到达。