A: Hey, Robert, what are you doing this weekend?
B: I didn't have any big plans.
A: We are putting together a birthday party for Mary.
B: That sounds like fun. Where will it be?
A: We thought it would be fun to have a pool party at Jay's house.
B: Oh good! Can I bring anything?
A: We will be providing hot dogs, hamburgers, and cake, but people can bring side dishes.
B: I am assuming that the dress is casual.
A: Dress casually【1】 and bring your bathing suit!
B: Wonderful. Just e-mail me the time and date and I'll be there.
A: Robert, do you have plans for the weekend?
B: I have nothing definite planned.
A: Saturday is Mary's birthday, and we are throwing her a party.
B: Sure, I could come to her party. Where are you going to have it?
A: It's going to be a pool party at Jay's apartment building.
B: That sounds like fun. Is it a potluck?
A: We would like for people to help us by bringing side dishes and drinks.
B: The dress will be casual【1】 then?
A: Make sure to bring your bathing suit, and dress casually【2】.
B: Sounds great. Just drop me an e-mail with the time you've picked.
1 casual
adj.漠不关心，冷漠的；随便的，非正式的；偶然的，碰巧的
参考例句：
He earns a living by casual labour.他靠做临时工为生。
The guests wore casual clothes.客人们穿着便服。
A: Robert, are you going to be in town this weekend?
B: I don't have anything scheduled yet.
A: We were wondering if you would like to come to Mary's birthday party on Saturday.
B: I would enjoy coming to Mary's party. Will it be at your house?
A: The party will be at Jay's house out by the pool.
B: Will everyone be pitching【1】 in with some food?
A: It would be great if you could bring a side dish, but the rest of the food will be provided【2】.
B: What should we wear?
A: This is a pool party, so make sure to bring your bathing【3】 suit.
B: Sounds like we'll have a great time. When you've figured out the details, drop me an e-mail.
1 pitching
n.铺地石，俯仰v.投( pitch的现在分词 )；用沥青涂；排列；把…定于特定角度
参考例句：
The ship was rolling and pitching heavily in the rough sea. 船舶在狂涛中簸荡。 来自《现代汉英综合大词典》
He was pitching the ball. 他正在投球。 来自《简明英汉词典》
2 provided
conj.假如，若是；adj.预备好的，由...供给的
参考例句：
Provided it's fine we will have a pleasant holiday.如果天气良好，我们的假日将过得非常愉快。
I will come provided that it's not raining tomorrow.如果明天不下雨，我就来。
3 bathing
n.游泳，洗海水澡
参考例句：
The place is convenient for bathing.这地方适合游泳。
Naked bathing is not allowed to this beach.这个海滩禁止裸泳。