incursion

1. N-COUNT If there is an incursion into a country, enemy soldiers suddenly enter it. 侵入[正式] [oft N 'into' n]

...armed incursions into border areas by rebel forces. ...叛军武装入侵边境地区。

2. N-COUNT If someone or something enters an area where you would not expect them to be, or where they have not been found before, you can call this an incursion, especially when you disapprove of their presence. 侵入[正式] [oft N 'of' n]

...her disastrous incursion into the property market. ...她非常不明智地转入房地产市场。