“两端首尾相接”可以翻译为“be joined end to end” 或者 “connect with both ends meeting”。
例如：
These two pipes are joined end to end to form a longer one.（这两根管子两端首尾相接，形成了一根更长的管子。）
The strips of paper were connected with both ends meeting to create a long chain.（这些纸条两端首尾相接，形成了一条长长的链子。）