Greeting:
Thank you all for being here.
謝謝各位的到來。
I want to thank you all for attending this… .
我想謝謝各位愿意前來參加這場…
I'd like to thank you for coming.
我想要謝謝你們的到來。
It's a pleasure / an honor for me to be here.
能夠站在這里是我的一大榮幸。
I'm very happy to have this opportunity to… .
我很高興能有這個機會來…
Good morning. Thank you all for being here. I'm very glad to have this opportunity to share my thoughts about environmental pollution with you.
早上好，謝謝各位的到來。我很高興能有這個機會來跟大家分享我對環境污染的看法。

Techniques:
There are… main aspects to this topic.
關于這個主題，大致可以從...個角度切入。
I've divided my speech / presentation into… parts.
我的演講／報告將會分成...個部分。
I'm going to start with… , and then talk about… .
我會先從...開始，然后談論…

Ending:
Thank you for listening, and I hope you enjoyed my… .
謝謝各位的聆聽，希望你們享受我的...
This is the end of my… , and thank you for your attention.
我的…到此結束，謝謝大家。
I appreciate the time you took to listen to my… , thank you so much.
我很感謝各位撥冗聆聽我的…，謝謝你們。
This is the end of my presentation. Thank you for listening, and I hope you all enjoyed my talk about environmental pollution.
我的陳述到此結束。謝謝各位的聆聽，希望你們有享受我關于全球暖化的談話。