?意思：指四代同堂，即祖孫三代或者父母子女三代同住一個屋檐下的家庭模式。

用法：這一短語通常用來形容家庭中多代人共同生活的情況，也可以用來指多個世代共同生活在一個社會或者中。

例句1：In traditional Chinese culture, it is common for four generations to live together under one roof, which is known as "sishi tongtang". (在傳統文化中，四世同堂是一種常見的家庭模式。)

例句2：With the aging population, the concept of "sishi tongtang" is becoming more and more popular in many countries. (隨著人口老齡化，"四世同堂"的概念在許多變得越來越流行。)

例句3：The traditional family structure of "sishi tongtang" has its advantages and disadvantages. (傳統的"四世同堂"家庭結構有其優點和缺點。)

例句4：In some cultures, the concept of "sishi tongtang" is seen as a symbol of strong family ties and respect for elders. (在一些文化中，"四世同堂"被視為強烈的家庭紐帶和對長輩的尊重的象征。)

例句5：Living in a "sishi tongtang" household can be challenging at times, but it also brings a sense of warmth and support from multiple generations. (生活在一個"四世同堂"的家庭中有時可能會有挑戰，但也會帶來多代人的溫暖和支持。)

同義詞及用法：四世同堂的另一個常用詞語是"三代同堂"，它們可以互換使用。另外，也可以用"多代共居"來表達相同的意思。