It may start with a concrete anxiety: Did I lock the back door?

它可能始于某个具体的焦虑：后门锁上了没有？

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To seize the space debris, the mechanical arm need to lock the concrete goal, but in space, debris is changing position.

要抓住太空碎片，这只机械手臂需要锁定具体目标，但在太空中，碎片是不断变换位置的。

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The paper presents various temperature control measures taken in ground concrete placement at permanent lock of Three Gorges Project during summer construction of 1999 .

介绍了三峡工程永久船闸地面混凝土在1999年夏季施工中所进行的各种温控措施。

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Above all, this is a kind of writing that accommodates variety narrative and essay, the concrete and the theoretical, the general and the metaphorical (that image of our lives like boats in a lock, waiting for the sluice gates to open).

NEWYORKER: Total Recall