如果要表达一个idea目前很受欢迎，用英文要用哪些不同的说法？请给出4个说法，并在答案最后提供一个中文翻译。
user
1. The idea is currently trending.
2. This concept is gaining widespread popularity.
3. The proposal is all the rage these days.
4. This notion is sweeping the nation.

中文翻译：这个想法现在很流行。
assistant