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。

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。

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.

如果您不希望在一系列操作之后产生的累积损失会影响到彩色图像的图像品质，通常png是个不错的选择。