選取牛津高階英漢雙解來作為解說的依據(jù)吧,比純英文的詞典更適合英語水平還不是特別高的中國人理解.
如果你用breath,那么在這個句子里面,my breath的搭配表明這個breath是名詞.breath作為名詞的解釋如下：
(a) [U] (also infml 口語亦作 puff) air taken into and sent out of the lungs （呼吸的）空氣:You can see people's breath on a cold day.冷天能看到人們呼出的空氣.* His breath smelt of garlic.他呼出的氣中有蒜味.(b) [C] single act of taking air into the lungs 吸氣:take a deep breath,ie fill the lungs with air 深吸一口氣.
而采用breathing的時候,breathing是breathe這個動詞的現(xiàn)在分詞或者動名詞.
[I] take air into the lungs and send it out again 呼吸:People breathe more slowly when they are asleep.人睡覺時呼吸比較緩慢.* She's still breathing,ie still alive.她仍在呼吸（還活著）.* He was breathing hard/heavily after racing for the train.他跑著趕上火車以后,吃力地喘著氣.
好了,不用我再多說了,我相信你已經(jīng)能毫不費(fèi)力的區(qū)分這兩者了.