The advantages and disadvantages of smartphones can be expressed in Engpsh by saying "the pros and cons of smartphones." This phrase comes from the words "pros" and "cons," which are short for "prosperities" and "contraries," respectively. These words are used to refer to the positive and negative aspects of something. Here are some examples of sentences using these phrases:

"What are the pros and cons of smartphones?" (这句话的中文翻译是：“手机的利与弊是什么？”)
"The pros of smartphones include their convenience and versatipty, but the cons include their potential for addiction and their high cost." (这句话的中文翻译是：“手机的优点包括它们的便利性和多功能性，但是缺点包括容易沉迷和昂贵的成本。”)
"Weighing the pros and cons, I think smartphones are worth it." (这句话的中文翻译是：“权衡利弊，我认为手机是值得的。”)