"o" : A memory operand is allowed, but only if the address is offsettable. ie, adding a small offset to the address gives a valid address.

对内存的操作被允许，但是必须支持地址偏移值，即，对于给出的地址，加上一个偏移量，此时也是一个合法的地址。

youdao

New York may be allowing fewer points per game (95.3 versus 105.7 last year) but the enhanced D has not offset the listless O.

WSJ: Jason Gay: Giants Hide Knick Pain

These countries enabled an unprecedented y-o-y growth of 19.3% in emerging markets last quarter, which more than offset dwindling sales in markets such as Europe and the United States.

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