並前往https://books.google.com.tw/books?id=U1EcNp_AZfUC&pg=PA15&lpg=PA15&dq=retromolar+trigone&source=bl&ots=o6lQ8F6Z45&sig=ACfU3U2XZjRdWbzC1GVxbeFoPDm3aNSJaw&hl=zh-TW&sa=X&ved=2ahUKEwjzwsGA3cT0AhWkoVwKHWHrBeIQ6AF6BQitAhAD