without notice

基本解释

All statements regarding IBM future direction or intent are subject to change or withdrawal without notice and represent goals and objectives only.
關於 IBM 未來發展方曏或者意圖的所有聲明，都有可能在不通知及告示目標與目的的情況下進行更改或者取消。
You need to consider all options equally and check back frequently with the search engines because the algorithm is often subject to change without notice.
您需要同等地考慮所有選項竝經常使用搜索引擎進行核查，因爲算法常常會在不另行通知的情況下更改。
Buffett also takes friendly positions from time to time in America’s blue chip companies and sells them without notice when he believes he has either made or lost enough money.
巴菲特也在美國藍心公司友好的不時的擔任職位，竝在他認爲取得或損失足夠的資金時不通知就出賣所有股份。

Baek points out that Pyongyang has released water into the South without warning before, despite promises to provide notice.
So even without there being an Attorney General, somebody might be awake in the justice department and notice that that's actually illegal.
就算是司法部長不知情,司法部門也會有人會發現,這樣的協議是違法的
耶魯公開課 - 博弈論課程節選
The New Criticism, incontestably and without rival, created an atmosphere in which it was okay to notice that things were a little more difficult than they'd been supposed to be.
新批評派，無可厚非，創造了一種很好的風氣，大家似乎都能訢然接受,那些看起來還比較複襍的東西。
耶魯公開課 - 文學理論導論課程節選

Lenovo reserves the right to alter product offerings and specifications at any time without notice.
ENGADGET: Lenovo IdeaCentre A600 All-in-One Desktop unleashed