“不准”造句
国外救援人员
不准进入灾区。
Foreign aid workers will not be allowed into the stricken areas.
谁也说
不准谈判还会拖多久。
There's no telling how long the talks could drag on.
科学家们越来越拿
不准这一技术是否正当合法。
Scientists are becoming increasingly unsure of the validity of this technique.