Do not utter a single word, without a word of foreign trade clerk in conversation with customers, make chat in disguise cold field, and lead to undesirable consequences.
Don't not to utter a single word, foreign trade salesman not to utter a single word when talking to a customer, will talk to disguise the ice, lead to adverse consequences.
Not speechless, said nothing when foreign sales conversations with customers, makes conversation pauses in a disguised form, result in undesirable consequences.