omit

【1】删去，省掉

【例】This article can be omitted from the contract．

合同中可以删掉这一条。

【2】遗漏，忘记

可接用不定式或动名词。

【例】We omitted [forgot] to ask in our last letter the season in which customers buy toys in India.

上次去信我们忘记询问印度顾客购买玩具的季节是什么时间。

on-and-off

时断时续的

同off-and-on。

【例】Through lengthy and on-and-off negotiations, now we have finally reached agreement.

通过长期而时断时续的谈判，现在我们终于达成了协议。

once

【1】曾经

【例】Once (being) the source of over 90 percent of the world’s cloves, Zanzibar now produces only about 10 percent of the international supply.

过去桑给巴尔是90%以上的世界丁香的产地，现仅生产国际丁香供应量的10%左右。