Given the task definition and input, reply with output. In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:In terms of the measurement of wafers and flat panels , it is very important to place the sensor chip precisely and without any contact along the surface . Sentence 2:Therefore , the chip is integrated directly into the bearing 's surface .
therefore