• The flight takes approximately three hours. 飞行大约需要三小时。
• The tickets cost about £20 each. 票每张约 20 英镑。
• The repairs will cost $200, give or take a few dollars. 修理费要花 200 美元，出入不过几美元。
• How much will it cost, more or less? 这个大概得花多少钱？
• We are expecting thirty or so people to come. 我们预计会来三十人左右。
• She must be 25 or thereabouts. 她肯定在 25 岁上下。
• Profits have fallen by roughly 15%. 利润下降了大约 15%。
• You can expect to earn round about £40,000 a year. 你可望一年赚 4 万英镑左右。
• The price is somewhere around $800. 价格在 800 美元上下。
• She earns somewhere in the region of £25,000. 她大约挣 25 000 英镑。

All these words and phrases are used in both speaking and writing; about is the most common and approximately the most formal. 上述各词和短语在口语和书面语中均可使用，about 最常用，approximately 最正式。