Now he can only communicate through a voicesynthesizer.
如今他只能通过声音合成器来进行交流。
《柯林斯英汉双解大词典》
2
He can communicate only through a voicesynthesizer, which he operates by laboriously tapping out words on the computer attached to his motorized chair.
Now he "speaks" only by using the slight voluntary movement left in his hands and fingers to operate his wheelchair's built-in computer and voicesynthesizer.