项 为单个字符提供了多种替代标志符号。
Random contextual alternates provide multiple substitute glyphs for a single character.
世界上一半的地区，生育率仅为2.1%，甚至更低。 这一比率通常被称作“生育替代率”，标志着人口数量的稳定。
the fertility rate of half the world is now 2.1 or less—the magic number that is consistent with a stable population and is usually called “the replacement rate of fertility”.
科学家称这种标志物为“替代品”，代表他们真正想要测量的东西——在本例中，即在过去冰的地理范围。
Scientists call such markers "proxies" for the thing they actually want to measure — in this case, the geographic extent of the ice in the past.
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