How can you quarantee the quality of translation ?

I  was acadmically trained in translation  and certified in China, with profound learning in both Chinese and English languages and well practiced skills in translation and interpretation.

Skills in interpretation are quite individual in nature, some can be learned in schools but mostly are  learned in a real world situation.  

Are You available to provide interpretation service at any time ? 

Yes,  24 hours for medical interpretation over the phone.  for other events such as immigration interview, court hearing and meetings, it is better to be scheduled in advance.  

How do you charge for your service ?

Fees are varied  but in a reasonable range, for example, sometimes, medical interpretation is charged for $ 40 /hour, while  interpretation for immigration interview is charged $100/hour,  interpretation for a conference is charged for  $300/day.