We would like to point out that delivery before Christmas is essential and hope you can offer us that guarantee.
我们想指出圣诞节前交货很重要并希望贵方能就此向我们作出保证。
But instruments far more delicate than that were needed if any really serious advance was to be made.
但是,如果要取得真正重大的进展,需要有比这种装置精细得多的仪器。