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- The researches show that the beforehand drainage could reduce the gas quantity effectively and it prevents gas outburst safely, economically, feasibly and effectively. 研究结果表明：采用大面积预抽煤层瓦斯的方法可以有效降低煤层瓦斯含量、保证巷道掘进安全。
- He arrived at the meeting place beforehand. 他提前到达会面地点。
- He came to look at the drainage. 他是来检查排水设备的。
- I had made preparations beforehand. 我预先作了准备。
- The drainage system has been aged. 排水系统已经老化了。
- I am going to get everything ready beforehand. 我将事先把一切准备好。
- We were aware of the problem beforehand. 我们事先就知道有这个问题。
- It had been arranged beforehand. 那事已提前安排好了。
- There's nothing like being beforehand. 最好的办法莫过於早作准备。
- beforehand drainage 预抽
- Actually I meant to notify you beforehand. 实际上我是想事先通知你的。
- The drainage of the town is not good, some of the pipes are broken. 城里的排水系统不好,有些水管断裂了。
- I wish I had told you about my father beforehand. 我希望我已预先把我父亲的情况告诉了你。
- If we are to go on the excursion, we must make ready the night beforehand. 我们如果要去旅行，就得在头一天晚上做好准备。
- If you are to go in the excursion, you must make ready the night beforehand. 如果你们要去旅行，就得在头一天晚上做好准备。
- We must dig a drainage ditch to run off the water. 我们得挖一条排水渠把水排掉。
- He prepared his paper beforehand. 他事先准备好了论文。
- We need to make an accurate estimate beforehand. 我们需要事先作出准确的估计。
- The town's drainage is very efficient. 这城市的排水系统很好。
- Excuse me for not telling you beforehand. 对不起，我事先没告诉你。
