並前往https://books.google.com.tw/books?id=9RiUDwAAQBAJ&pg=PA89&lpg=PA89&dq=%E7%A6%8F%E7%89%B9focus%E8%BC%AA%E8%83%8E%E5%83%B9%E6%A0%BC&source=bl&ots=Fqv2iid0ud&sig=ACfU3U1h18ZxFdnIlDRV5V9MIYZz9rvPZQ&hl=zh-TW&sa=X&ved=2ahUKEwi878jpm9uAAxVUCjQIHY0oB20Q6AF6BQiOARAD