As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.

与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。

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Extents An extent is a way to improve the efficiency of on-disk file descriptors, reducing deletion times for large files, among other things.

extent extent是一种提高磁盘文件描述符效率的方法，它能够减少删除大型文件所需的时间等等。

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To a large extent the us summer leisure industry relies on an influx of cheap teen Labour.

美国的夏季休闲业从很大程度上，依靠的是在暑假大量涌入的廉价青少年劳动力。

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So to some extent we can view an insurance company as actually a large investment fund: investing that float for however long the company gets to keep it.

FORBES: Explaining Warren Buffett's Career In One Paragraph

The plan worked to an extent, but the sales of the improved Saabs never grew large enough to create a positive dollar return for GM.

CNN: The fate of four GM brands

Mr. WITTE: Well, it's an interesting question because FEMA is an agency, obviously, that is under attack right now, very heavily criticized, and it's an agency that is being criticized in large part because the agency has been hollowed out, to a certain extent.

NPR: Post-Katrina Contractors in the Gulf Region