onto

A2 CET-4 Oxf 3000 高中 FREQ #1581 ★★★☆☆

prep. 在...之上

发音

UK /ˈɒn.tuː/
US /ˈɑn.tu/
US /ˈɔn.tu/
其它 /ˈɔn.tʉ/
SCOT /ˈɔn.tʉ/
UK /ˈɒn.tə/
US /ˈɑn.tə/
US /ˈɔn.tə/
其它 /ˈɔn.tə/
SCOT /ˈɔn.tə/
UK /ˈɒn.tʊ/
US /ˈɑn.tʊ/
其它 /ˈɑn.tʊ/
US /ˈɔn.tʊ/

别名

on to

教材释义与例句

形容词

映射的；自身的；映成的

介词

在…之上；对…了解；映射到…上

used to say that someone or something moves to a position on a surface, area, or object

释义与例句

adj.
  1. 1.

    Attaining each of the values in its codomain; having its image equal to its codomain.

    数学

    Considered as a function on the real numbers, the exponential function is not onto, as it never takes on values less than or equal to zero.

prep. A2 Oxf 3000
  1. 1.

    Arriving upon or on top of (speaking of a physical or metaphorical movement).

    My cat just jumped onto the keyboard.

    A new drug has just come onto the market.

  2. 2.

    Aware of.

    非正式

    The thought-police were onto my plans of world domination.

  3. 3.

    Being an onto function with a codomain of (see below).

    数学

    The exponential function maps the set of real numbers onto the set of positive real numbers.

相关短语

hold onto 紧紧抓住，不卖出 onto function onto functions hold onto your hat be onto something hang onto your hat call onto the carpet calls onto the carpet calling onto the carpet called onto the carpet be onto nothing call on the carpet 责备某人 latch onto 与…交往,结交;抓住,弄到;理解,懂得 back onto get onto 识破; 给…讲; 乘（飞机、汽车等）; 着手谈及

词源

From on + to, after into. Compare Saterland Frisian antou (“up to”).

来源：wiktionary