看到一个 a+复数 的句子，有点不解

rushgoon

will be taking an incredible three and a half strideS per second
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这句使用了一个a+复数名词的形式。请问应该怎么理解呢？
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lgmcw

The "correct" form is:
3 H$ ]/ X! a; h1 c4 I8 O! Cone hour and a half
a mile and a half
( k. H3 m6 Z3 f0 ?# F; H4 M9 [one ounce and a quarter

! V8 e' [" u) pHowever, in normal English usage, native speakers often say:
one and a half hours
8 g2 p, v! ?0 B1 s% A* {4 o, i/ O' oone and a half miles
one and a quarter ounces

Ref
1 i/ H' ~3 D# k6 y所以这里是 (three and a half) stides
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鸭呼嘿

语言是如此复杂，以至于几乎每一条语法“规则”都有例外, 或者说简单的规则都有例外。

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不定冠词A(N) 一般至于单数可数名词连用，但是有时候是可以与复数可数名词连用的。
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I'm a good twenty years younger than my wife. [ MY DREAM, oh God bless me]
8 U: ^0 O7 q. t4 E- JI ate a good three hefty steaks this morning.】
  }; P. Z1 h! wI took a marvelous eighty points in the game.
They allowed us only a skimpy two days of vacation.
! W; C9 c5 i! F# y! Y$ h) Z% V(I gave her another twenty minutes to finish her typing.)
7 [. K; f, A. Y...an incredible three and a half strides... [as in your example sentence]
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形式：a(n) + adjective + number + plural nouns
意义：这种用法多多少少有强调、惊叹的意思。强调、惊叹的意思表现在那个形容词上面，而强调、惊叹的原因是那个数字。
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  Y. ?; X3 _& |. h【注：a good twenty/three... 中的good是个强调词(又如 a good many... 参见nice), 与上列其他的例子又有所不同，因此其后的名词前面仍可以有形容词，这个形容词才对应于上述“强调、惊叹的意思”所表现在的“那个形容词” ， 例如上举‘’hefty‘’.】
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这种用法虽说是“例外”，但也不算很罕见。

5 W/ c9 l3 x: f4 g* x5 LIncidently, I'm afraid that there is a mistake in one of the sentences in the picture: the 'unawares' should have been 'unaware'.

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一只考研狗

a + 速度
three and a half strideS per second指的是速度每秒3.5步，看作整体。
个人理解。

28836919

三个半，有什么问题？

三年半怎么说？
  v, M. e5 e, {5 Z& S7 t0 k$ R2 }三米半怎么说？

leezzzz

three and a half，3.5啊，一秒3.5步

932524511

3.5, 在英语中大于一的都要复数～