one second是一秒,one seconds是二分之一?

英文中‘1比30’怎么念,
如,模型安1：30的比例制作,
读时,怎么说?
如‘1/2’,读作‘one second’
和几分之几的表达方法一样啊？

one second 到底对不对啊 怎么么有的说行 有的说只能是 a half 呢
二分之一 不是一秒

英语翻译
Dwight Howard:One Second left...trying to get the last shot.
Kobe Bryant:I was measuring the whole time.I knew I had to knock it down.
Dwyane Wade:When I shoot it,the only thing in my mind is the ball going in.
Kobe Bryant:I knew I had to knock it down.
Dwyane Wade:I didn't need an opportunity by puttin the ball in my hands.
Chauncey Billups:Trying to get the last shot when we're down two.
Greg Popvich:Kick it!
Chauncey Billups:The last minute of the game.
Vinny Del Negro:Shoot it!
Kobe Bryant:I knew I had to knock it down.
Carmelo Anthony:Big shots.Crunch time.
Announcer:Bryant for the win!Got it!
Carmelo Anthony:They're the moments that I live for.
Dwight Howard:One second left...
Kobe Bryant:I knew I had to knock it down.
别在GOOGLE翻译过来啊.这是篮球NBA的

半公斤牛肉可以用one second of beef来表达么
one second kilogram of beef ,是这个，打错了

请高手指点one second 的用法
麻烦翻译一下这句话 One second I’m thinking ‘life sentence’
one second 什么意思啊,有人翻成一想到,难道one second也可以做时状从句的连词?我没有查到有这种用法吗.
请高手指点.