There were originally 2,800 species of fish in our country. Due to various reasons such as the environment, there are now 2,700 species left, which is less than the original ((())/(())).
我国原有鱼类2800种，由于环境等多种原因，现在还剩2700种，比原来减少了((())/(()))．
<gadget id="calculator">2_800 - 2_700</gadget>
<output>100</output>

<gadget id="calculator">100 / 2_800</gadget>
<output>1/28 = around 0.035714</output>

<result>1/28 = around 0.035714</result>