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推文有些板友建議「可以投完之後再改用DH/換去外野啊」之類的
我們來看官方規則怎麼說的

https://www.mlb.com/glossary/rules/designated-hitter-rule

節錄比較重點的段落

The DH must be selected prior to the game, and that selected hitter must come
to bat at least one time -- unless the opposing team changes pitchers prior
to that point. A team that chooses not to select a DH prior to a game is
barred from using a DH for the rest of that game. A player who enters the
game in place of the DH -- either as a pinch-hitter or a pinch-runner --
becomes the DH in his team's lineup thereafter.

如果一支球隊在賽前沒有指定打擊，比賽開始後不得要求指定打擊。也就是說若大谷二刀
流，接他後面的投手要嘛自己上去打要嘛換代打（當然投手也就得跟著換）。

If a player serving as the DH is later used on defense, he continues to bat
in his same lineup spot. But for the rest of the game, his team cannot use a
DH to bat in place of the pitcher. A team is also barred from using a DH for
the rest of the game if the pitcher moves from the mound to another defensive
position, a player pinch-hits for any other player and then becomes the
pitcher, or the current pitcher pinch-hits or pinch-runs for the DH.



以上。

※ 引述《thnlkj0665 (灰色地帶)》之銘言：
: https://tinyurl.com/mr2vntfr
: Joe Maddon said Shohei Ohtani told him he wants to pitch and hit tomorrow.
: 天使隊總教練梅登在今天賽後採訪談到大谷翔平
: 透露大谷向他表明希望能夠在明天比賽同場二刀流，擔任先發投手，並且上場打擊
: 但是由於目前天使隊板凳人手吃緊，大谷如果投完退場之後調度並不容易
: 不過梅登也坦承不讓大谷上場打擊的確是有難度
: 大谷即將於明天面對遊騎兵隊登板先發，先前投了兩場先發，都是無關勝負
: 主投8.2局被擊三支安打，失掉一分自責分，投出14次三振以及11次保送  防禦率 1.04
: 而他在最近棒子也是相當火燙，連續兩天比賽都有全壘打的演出
: 打擊三圍 .286/.321/.662   OPS 0.983    七發全壘打  16分打點

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