But he does not count it a serious loss in a series that can only touch the surface of such a vast subject.
不过他并不认为这是一次严重的损失，毕竟在如此广泛的主题中这只是凤毛麟角。
2
Historians, and some statisticians, bemoan the impending loss of a continuous data series that, in some cases, goes back over two centuries.
历史学家，以及一些统计学家抱怨，在某些情况下，即将损失的一系列资料，可以追溯到200年前。
3
PNG is normally a good choice for color images where you don't want accumulating loss to affect the quality of the image after a series of manipulations.