cautioned的音標為[?k????n(d)]，基本翻譯為“警告”，速記技巧為：以“ou”結尾的單詞容易發成/?/，這里發/??/。

Caution的英文詞源可以追溯到拉丁語詞cautionem，意為“警告”。它的變化形式包括：caution（警告）、cautious（謹慎的）、cautiously（謹慎地）等。

相關單詞：

1. Cautious（謹慎的）：這個詞由caution和-ous構成，表示小心謹慎的意思。例如，在商業談判中，我們需要保持謹慎，以免做出錯誤的決策。

2. Cautiously（謹慎地）：這個詞由caution和-ly構成，表示小心謹慎地行動。例如，在處理危險物品時，我們需要謹慎行事，以確保安全。

3. Cauterize（燒灼）：這個詞由caution和-erize構成，表示用燒灼的方法來止血或消毒。例如，在外科手術中，醫生可能會使用燒灼的方法來處理傷口。

以上這些單詞都與caution有著密切的聯系，它們都體現了小心謹慎、注意安全的原則。在英語中，caution的使用頻率非常高，它提醒我們要時刻保持警惕，以免發生意外或危險的情況。

總之，caution作為英語中的一個常用詞，它提醒我們要時刻保持警惕，避免犯錯或造成不必要的損失。同時，它也體現了人類對安全和風險的重視和關注。

常用短語：

1. caution against

2. be on one"s guard

3. exercise caution

4. take precautions

5. be careful

6. proceed with caution

7. exercise due care

例句：

1. We must caution against risks in investing.

2. Be on your guard against thieves.

3. When driving, we must exercise caution and take precautions against traffic accidents.

4. She always proceeds with caution when crossing the street.

5. When dealing with strangers, we should be careful and not disclose personal information.

6. We should exercise due care when making decisions to avoid making mistakes.

英文小作文：

Cautiousness is a crucial quality in life. Whether it"s driving on the road, making financial decisions, or taking on new responsibilities, being cautious can help us avoid potential risks and make better decisions.

When it comes to investing, caution is even more important. Investing involves risk, and we need to be careful not to make decisions based on hypes or blindly chase returns. Instead, we should carefully research the investment opportunities and weigh the risks and rewards before making a decision.

On the road, cautious drivers can avoid accidents and protect themselves and others on the road. Similarly, in our personal and professional lives, we need to be careful not to rush into things or make hasty decisions that could have negative consequences.

Being cautious doesn"t mean being afraid to take risks, but it does mean being aware of the risks and taking steps to minimize them. By being cautious, we can avoid unnecessary risks and make better choices that lead to success and happiness in life.