Among the 100 tourists, 70 understand Chinese, 52 understand English, and 10 understand neither language. How many people know only Chinese but not English?
100位旅游者中，70人懂中文，52人懂英文，还有10人两种语言都不懂．问只懂中文不懂英文的有多少人？
<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<gadget id="calculator">52 - 90</gadget>
<output>-38</output>

<gadget id="calculator">70 + (-38)</gadget>
<output>32</output>

<gadget id="calculator">70 - 32</gadget>
<output>38</output>

<result>38</result>