Many of the sound effects he pioneered are still in use today, like creating thunder by pulling on one of the corners of a thin copper sheet.
他首创的许多音效至今仍在使用，比如通过拉动薄铜板的一角来制造雷声。
2
While theoretically sound (it is possible to process many XML vocabularies with a single style sheet), experience showed that this approach is not as convenient as I had expected.
The steps we have taken over the last two years, including those we are announcing today, have put us on very sound financial footing with a strong balance sheet and substantial cash flow.