Yusufu Mieraili and Bilal Mohammed, both members of China's Turkic-speaking Muslim minority, are accused of planting a bomb at a popular Hindu shrine in the heart of the Thai capital in August 2015.
The blast killed 20 and wounded more than 100 people, making it the worst assault on Thai soil in recent history.
Thai authorities have been criticised for a murky investigation that appeared to wind down shortly after the arrest of the two men, leaving more than a dozen key suspects at large.
He is on the run and the defence has been unable to secure a new translator in time, the defendant's lawyer told the military court today.
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The judge agreed to postpone the trial until the next hearing date on 15 September, according to an AFP reporter inside the courtroom, where note-taking is banned.
The translator accused police of planting drugs on him as punishment for helping Thailand's Uighurs -- a Muslim minority that rights groups say face persecution in their homeland in northwest China, forcing many to flee.
But Thai authorities have insisted the two incidents are unrelated.
Today the defendants -- who deny involvement in the attack -- were escorted by security officers to the back entrance of a military court in the junta-ruled country.
They have spent the past year held in a jail inside a military barracks, where Mohammed has accused his captors of beatings and denying him halal food.
Thai authorities have denied those allegations.
Mohammed, also known as Adem Karadag, is accused of being the man seen on CCTV footage placing a backpack at the Erawan shrine moments before the explosion.
Mieraili is accused of delivering the backpack bomb.
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