聽力文本如下：

A “feature” is a characteristic.

A “product feature” is something that a product has or does.

For example, product features for a computer include its memory, screen size (if it's a laptop), and speed.

Next, Alex says that “last but not least” he'd like to introduce Shawn.

“Last but not least” is a phrase used to talk about the last person or thing in a group, meaning that it is not less important, however, than the other people or things that were already mentioned.

In this case, Alex has already introduced Hannah and Chris.

By saying “last but not least,” he's telling people that even though Shawn is the third and last person to be introduced, he is not the least important.

Alex says that Shawn has been “coordinating” the marketing efforts.

The verb to “coordinate” means to organize and lead something.

In other words, Shawn is in charge of the marketing efforts.

You might be responsible for “coordinating” a party or a meeting.

Finally, Alex says that Shawn's hard work during the past seven years is “culminating” in today's presentation.

The verb to “culminate” (culminate) means to reach the highest point in the development of something, or to finish something with a specific result.

Shawn's seven years of hard work have led up to this presentation, which is the final result of his work.

One might say that years of a runner's training culminate in winning a race.

Alex ends the introductions by saying, “With that, I'll turn it over to Shawn.”

The phrase “with that” is used to show that one part of something has ended and now it is time to move to the next part.

Alex is using the phrase to let people know that the introductions have finished and now it is Shawn's turn to speak.

A student might say, “I've just finished two papers and with that, I'm ready for summer vacation!” This means that the student has finished the last two papers for the semester and now the semester has ended and the student can enjoy their vacation.

When Alex says that he'll “turn it over” to Shawn, he means he's going to put Shawn in control of something - in this case, Shawn is going to be in control of the next part of the presentation.

If someone has too much work to do, he or she might turn a project over to a co-worker, so that someone else can do part of the work.

Alex says that Shawn will “lead the proceedings today.”