1. Thank you: First of all, thank you for your trust. For example, "Thank you for giving me this opportunity. Thank you for your trust in me. "
2. Explain the current situation: explain your current workload and let the leaders know your actual situation. For example, "However, the project I am currently engaged in keeps me busy, and I am worried that if I accept this extra task, I may not be able to guarantee the quality."
3. Make suggestions: If possible, make solutions or suggestions. For example, "Do you think it is possible to assign this task to other colleagues, or wait for me to finish the project at hand?"
4. Keep a positive attitude: show that you are willing to take on more responsibilities when appropriate. For example, "I would like to take on more responsibilities in the future if I have the opportunity."
5. Communicate in time: communicate your work with the leader at an appropriate time and let the leader know your work progress and pressure.
6. Learn to refuse: Sometimes, refusal is a way to protect your rights and interests. Learn to say "no" politely but firmly to avoid putting too much pressure on yourself.
7. Be professional: In the whole process, be professional and polite, and avoid letting emotions affect your expression.