If the file begins with a delimiter, the node treats the (zero length) file contents preceding that delimiter as a record and propagates an empty record to the flow.
如果文件以分隔符开始，则节点将该分隔符之前的(零长度)文件内容视为一个记录，并向流传播一个空记录。
3
Often used in capital budgeting, IRR is the interest rate that makes net present value of all cash flow equal zero.