参加的孩童年纪介于9到14岁，他们会被教导如何操作数位相机。
The children taking part, aged between 9 and 14, were given basic instructions on how to operate the digital cameras.
步骤4：所有的操作符都是二元的，也就是说第一个操作数位于操作符之前，第二个操作符位于操作符之后。
Step 4: All operators are binary, which means that the first operand is positioned before the operator, and the second operand is positioned after the operator.
操作数的小数位数调整为位数参数指示的位数。
Operand will be adjusted to the number of digits indicated by the digits parameter.
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