需要索引（如算距离、下标）：栈存索引，用 nums[stack.at(-1)] 取值比较。
The German firm supplies about three-quarters of the bone cement needed in the NHS. The product is used in more than 1,000 operations a week, mostly in knee replacements, but also in some hip and shoulder replacements.
。搜狗输入法下载对此有专业解读
박영재 대법관, 법원행정처장직 사의…사법개혁 반발 고조
2月以来，深藏幕后的“盛屯系”接连出手：一边将亚洲最大硬岩型单体锂矿完全收入囊中，一边远渡重洋拿下了加拿大上市公司Loncor手中的非洲金矿。
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