听力文本如下：

Alex starts by saying, “Before we dive into the presentation, I should probably start by saying that I'm Alex Aurora.”

To “dive into something” means to begin something right away, so when Alex says “before we dive into the presentation,” he means “before we begin the presentation.”

If you are excited about a project, you probably want to dive into it right away.

Alex introduces himself as “the CEO (or Chief Executive Officer) of Vision Corporation, just in case there's anyone here who hasn't met me in person before today.”

The phrase “just in case” means if something may happen, or if something is possible.

Someone might decide to buy groceries for the entire week, just in case they don't have time to go shopping later in the week.

Alex believes that most or all of the participants already know him, but just in case there is someone who hasn't met him in person, he wants to introduce himself.

To “meet someone in person” means to be introduced to someone while being in the same room, so that the two people see each other.

If you're introduced to someone over the phone or email, you haven't met in person.

Alex then asks each of the team members to introduce themselves and he says, “Hannah, why don't we start with you?” The phrase “why don't we” is a polite phrase that means “let's - let us do this,” and is used to suggest doing something.

For example, “Why don't we listen to that podcast again?” Or, “Why don't we go to the movies tonight?” You're not really asking why we are not going to the movies.

Instead, you're suggesting that we go to the movies.

Hannah introduces herself as an “account representative,” which is an employee at a consulting company in charge of a project for a company using the consulting company's services.

Hannah doesn't work for Vision Corporation.

Vision Corporation hired a consulting company to help them with their market research, and Hannah is the “account representative,” or the person who works for the consulting company and is assigned to the Vision Corporation project.

Hannah says that she has been working with the focus groups, the people who give their opinion about Vision Corporation's product, and that today she'll be talking about the target market, or the group of people that Vision Corporation is trying to sell its product to: the “target market.”

Next, Chris introduces himself as the Senior V.P. , or Vice President, of Product Development.