The first clue is that there are rocks near the coast which are considered to be made by Chinese explorers .
The first clue is that there are rocks near the coast which are considered to be made by Chinese explorers . The first clue is that there are rocks near the coast which are considered to have been made by Chinese explorers . The first clue is that there are rocks near the coast which are thought to have been made by Chinese explorers . The first clue is , that there are rocks near the coast which , are considered to be made by Chinese explorers .
The first clue is that there are rocks near the coast which are considered to be made by Chinese explorers .
修正这句话的语法问题: The first clue is that there are rocks near the coast which are considered to be made by Chinese explorers . 输出: