who can tell me how to distinguish Thai vowel"ด“and"ต“

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just like yuvonkijung said, ด = Door << (pronunciation) ต = Tor. But when they are use as final consonant, they give the same sound 'd'

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ด = Door << (pronunciation) 
ต = Tor << (pronunciation)

ต = d (pinyin)

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ด=Do(ดอ)   
ต=To(ตอ)

ดา (Da) = ด + อา  D+a
ตา( Ta)  = ต + อา   T+a

The 9 middle class consonants.They are ก, จ ,ด, ต, ฎ ,ฏ ,บ ,ป ,อ