记忆技巧：找「更大」→ 弹掉 ≤ 当前的（栈顶保留比当前大的）；找「更小」→ 弹掉 ≥ 当前的；找「相等可接受」→ 用 < / ，否则用 <= / =。
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Ocado to cut 1,000 jobs in £150m cost-saving drive
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Their mission: to find out if men could survive two weeks in space. If not, the Moon was out of reach.
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