1. Of course, when it comes to expressing the idea of "当然" in English, there are a few different phrases and expressions that you could use. One common option is to simply say "of course." This phrase is often used to indicate that something is obvious or well-known, and to express agreement or affirmation.

2. Another similar option is to say "certainly," which has a similar connotation of expressing agreement or affirmation. This word can be used in a variety of contexts, from agreeing with someone's statement to expressing certainty about something.

3. Another possible option is to use the phrase "no doubt," which implies a high level of certainty or confidence in something. This phrase can be used to express that something is very likely or expected to happen, or to indicate that there is no question or uncertainty about a particular topic.

4. Additionally, you could use the phrase "without a doubt," which has a similar meaning to "no doubt" but emphasizes even more strongly the idea of certainty or confidence. This phrase is often used to emphasize that a particular statement is unquestionably true or to express a strong belief or conviction about something.

5. Finally, it's worth noting that there are many other ways to express the idea of "当然" in English, depending on the specific context and situation. Some other possible options might include phrases like "absolutely," "undeniably," or "beyond question." Ultimately, the best way to choose a phrase will depend on the specific context and the desired tone and emphasis of the speaker.

6. In summary, there are many different ways to express the idea of "当然" in English, including phrases like "of course," "certainly," "no doubt," and "without a doubt." Each of these phrases has its own nuances and implications, and the best choice will depend on the specific context and the speaker's desired tone and emphasis.

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