弄清,确定,查明( ascertain的过去式和过去分词 );

It'should be ascertained if preventive or control procedures have already been attempted.
应查明是否已采取了预防或控制措施.
来源:词典精选例句The optimum technological parameters were ascertained by orthogonal experiment.
用正交试验方法优化确定了工艺参数.
来源:互联网摘选These accidents have been ascertained through investigation to be major liability accidents.
通过调查认定,都是重特大责任事故.
来源:互联网摘选She could not take her ease till she had ascertained some particulars.
她得把有些具体事弄确切了,才能放下心来.
来源:互联网摘选Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
生物学家已经确定有专门的细胞把化学能转变成机械能.
来源:互联网摘选The previously unidentified objects have now been definitely ascertained as being satellites.
原来所说的不明飞行物现在已证实是卫星.
来源:《简明英汉词典》The previously unidentified object has now been definitely ascertained as satellites.
先前的不明飞行物现在已经查明了是卫星.
来源:互联网摘选As a matter of fact, you needn't bother to ascertain. I ascertained. They're real.
说实在的, 你们不必细看,我检查过了,统统都是真的.
来源:词典精选例句The first ascertained appearance of the Aryan family was in connection with the domestic animals.
雅利安族最初呈现的明确形象是与饲养家畜分不开的.
来源:词典精选例句The rim of the plugs is usually not exposed and the enveloping material cannot be ascertained.
岩栓的边缘通常是不露出的,因而不能确定其包裹的物质是什么.
来源:词典精选例句
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