The changelings select carefully, for such opportunities might come along only once a decade or so.

换生灵挑选对象很仔细，因为这种机会大概十年左右才有一次。

youdao

It requires districts to have the same population, so that their boundaries must be redrawn after every census (ie, once a decade).

这就要求每个选区做到人口数目一致，每次人口普查(十年一次)之后重新划分选区。

youdao

Depending upon the vehicle you drive, your spark plugs may need to be changed as often as yearly or as rarely as once a decade or so.

取决于你驾驶的车辆，你的火花塞或许得一年一换，或许十年之内无需更换。

youdao

The vote,which has been postponed several times since 2005, is an attempt to find a lasting political solution to nearly a decade of internal conflict in the once stable West African nation.

VOA: standard.2009.09.29

It had happened only three times in her life, less than once a decade.

NEWYORKER: Shauntrelle

Entirely new jetliners get developed only about once a decade, costing billions of dollars.

WSJ: Boeing Shows How Innovation Can Be Messy

Turning to the motion, Mrs Murray said the opportunity to reform the "disgraceful" Common Fisheries Policy happens "once a decade".

BBC: Common Fisheries Policy debate