Jeans, the all-purpose denim trousers, have been around for over a hundred years.牛仔裤，这种适合各种用途的斜纹粗棉布裤子，已经有一百多年历史了。He must have been around his mid-forties at least, but he'd worn well.他至少该有四十五六岁了，不过显得很年轻。The principles of magnetic recording have been around for a long time.磁性录音的原理已经应用很长时间了。