?firstblood是一個英文單詞，意思是“第一滴血”。它可以用作名詞，也可以用作動詞。

用法：

名詞：指的是在戰斗或比賽中，第一次流出的血液。

動詞：指的是在戰斗或比賽中，第一次使對方受傷或流血。

例句1-5句且中英對照：

1. The firstblood in the battle was shed by the enemy. (在戰斗中，第一滴血是敵人流出的。)

2. He drew firstblood in the boxing match with a powerful punch. (他用一記有力的拳頭打出了拳擊比賽中的第一滴血。)

3. The team scored firstblood in the game with a quick goal. (這支球隊通過快速進球在比賽中取得了先機。)

4. The athlete's firstblood was a minor cut on his hand during the marathon race. (這位運動員在馬拉松比賽中手上被割傷，這是他的第一滴血。)

5. The detective was determined to draw firstblood and solve the case before anyone else did. (這位偵探決心要先下手為強，在其他人之前這個案件。)

同義詞及用法：

1. First wound：指的也是戰斗或比賽中造成的第一個傷口。

例句：He received his first wound in the battle, but he kept fighting. (他在戰斗中受了第一次傷，但他繼續戰斗。)

2. Initial injury：指的是最初的傷害。

例句：The initial injury was just a scratch, but it got worse over time. (最初的傷害只是一道擦傷，但隨著時間推移變得更嚴重。)

3. Opening blow：指的是在戰斗或比賽中給對方的第一次打擊。

例句：The opening blow was delivered by the champion, stunning his opponent. (冠給對手以第一次打擊，讓他震驚。)

4. First strike：指的也是在戰斗或比賽中給對方的第一個攻擊。

例句：The first strike was made by the attacker, taking his opponent by surprise. (攻擊者發起了第一次攻擊，讓對手措手不及。)

5. Primary wound：指的是主要或最重要的傷口。

例句：The primary wound was on his leg, causing him to limp during the race. (主要傷口在他的腿上，在比賽中導致他跛行。)