The last operation is particularly useful because it lets us perform symbolic manipulations on the tree.

最后一项操作尤为有用，因为它允许我们在树上执行符号操作。

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The status box in the lower left indicates the total number of requirements selected, as well as the last operation completed.

左下角的状态栏指示了被选中需求的总数，以及最近完成的操作。

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One day after the last operation, the fistula surgeons moved on, already thinking about the countless new cases that awaited them.

最后一个手术结束的那天，瘘管专家们又继续前行，他们已经在想着还有数不尽的新增病例在等待着他们。

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U.S.officials say,in addition to the refueling operation, Japan has contributed $2 billion worth of aid to Afghanistan during the last eight years.

VOA: standard.2009.10.20

We saw last time that there is this remainder operation.

我们上次看到，这里是剩下的操作。

哈佛公开课 - 计算机科学课程节选

The judge ruled on Tuesday the surgery should go ahead after an MRI scan revealed a residual tumour left from the boy's last operation.

BBC: Neon Roberts 'should have radiotherapy' for tumour

"My last operation in August was a success but this time the doctors can't operate, " said Robson, who has started a six-week course of chemotherapy.

BBC: SPORT | Football | Robson fighting new cancer battle

Steam passenger Tube trains were last in operation in 1907, but steam locomotives hauled freight and engineers' trains until 1971.

BBC: London