A working equation expresses the unknown quantity in terms of the known ones.
A working equation expresses the unknown quantity in terms of the known ones.
分词短语出现在句尾，用逗号隔开，表示伴随情况说明，非常常见。
A working equation expresses the unknown quantity in terms of the known ones.
分词短语出现在句尾，用逗号隔开，表示伴随情况说明，非常常见。