There are about 700 species of freshwater fish in my country, which is 1,300 less than that of marine fish. What percentage of the species of freshwater fish in my country is equivalent to that of marine fish?
我国淡水鱼种类大约有700种，比海洋鱼类少1300种，我国淡水鱼的种类相当于海洋鱼种类的百分之几？
<gadget id="calculator">700 + 1_300</gadget>
<output>2_000</output>

<gadget id="calculator">700 / 2_000</gadget>
<output>7/20 = around 0.35</output>

<result>7/20 = around 0.35</result>