什么词性?

speed
名词 n.
1.速率,速度[C][U]
The train is travelling at a speed of sixty miles an hour.
火车正以每小时六十英里的速度行驶.
2.快速,迅速[U]
You work with amazing speed.
你工作起来速度奇快.
3.(胶片等的)感光速率;(摄影机的)曝光速率[C][U]
4.(汽车等的)变速装置,排档[C]
The young man just bought a 10-speed bicycle.
这个年轻人刚买了一辆十速自行车.
5.【俚】脱氧麻黄碱(一种兴奋剂),安非他命[U]
6.【古】幸运,成功;昌盛[U]
不及物动词 vi.
1.迅速前进,快行[Q]
The ambulance sped to the hospital.
救护车急速向医院驶去.
2.(通常用进行时)行进得过快,超速行驶
Tom was fined for speeding.
汤姆因超速行车被罚款.
3.加速[(+up)]
4.【古】过日子;兴隆;成功
及物动词 vt.
1.快速传送;发射
Now space satellites are used to speed long distance calls.
现在人造卫星被用来快速传送长途电话.
2.急速送至[O]
3.促进;加快...的速度
Fresh air and nutritious food will speed his recovery.
呼吸新鲜空气,吃有营养的食物会促进他身体的康复.
4.调整(机器等的)速率;使定速运行
5.祝愿...一路平安;祝愿...早日成功
6.【古】使成功;使兴隆
-speed
复合形 comb.form
1.(构成形容词)表示"有...速的"(如:a 10-speed bicycle有10速的自行车)