【正确答案】The missing words are in bold type. Call from Henri Morand, Transocean S.A., Bordeaux. Both AR 707s running for 6 weeks now. Did usual routine tests before installing them in labs but now one unit is noisy. Makes a loud harsh vibrating noise, as if drive motor is unbalanced or one of the heads touching side of case. Happens 2 or 3 times a day. After 30 secs noise stopped and readings normal. Question: Is this a fault they should worry about? If it is a problem that needs fixing they can send the unit back. Please confirm that this will be at our expense and they can have replacement unit immediately. Or they have unit examined by local expert - at our expense. Call him at home tomorrow am on 56 52 60 44.

【答案解析】[解析] Mr Morand: This is Henri Morand (HENRI MORAND) from Transocean S.A. (TRANSOCEAN) in Bordeaux. You sent us two of your AR 707s by air freight, which arrived safely last month. We've had both units running for six weeks now. Now, we did the usual routine tests on them before installing them in our laboratories but now that we have them both in use, we've found that one of them seems to be rather noisier than the other. Every so often one of the units seems to make a very loud sort of harsh vibrating noise, as if the drive motor is unbalanced or one of the heads is touching the side of the case. This happens for no apparent reason two or three times a day, and it always happens with the same unit. The first time it happened we were terrified because we thought the whole unit was about to blow up! But after about half a minute the noise stopped and the readings were normal. Now we don't really want to take the unit out of service, as the performance of the unit seems to be unaffected and we can't really do without it now. So what we'd like to know is this: is this a fault that we should worry about or not? If it is a problem that needs fixing (and I assume you would know this from your after- sales reports on other units) we can send the unit back to you, but if we do I'd like you to confirm that this will be at your expense and that we can have a replacement unit immediately. The alternative is for us to have the unit examined by a local expert - again at your expense. So can you let us know which of these alternatives you recommend? If you can call me at home tomorrow morning, please, I'd be very grateful. The number is 56 (that's the area code) 52 60 44. All right?