並前往https://books.google.com.tw/books?id=BHdvkJsgUPwC&pg=PA10&lpg=PA10&dq=Focus+on&source=bl&ots=W_Mvu7_wUB&sig=ACfU3U0WchK-UojDLN0sZKgoLgfS21ObeA&hl=zh-TW&sa=X&ved=2ahUKEwiNlJbpm_7_AhUxrJUCHZkBC6wQ6AF6BQjkAhAD