他们对食物进行化验以确定是否有毒。
有感冒症状主诉的被检旅客已经送交医生并提取了拭子样本进行化验。
The people tested had gone to general practitioners with complaints of flu-like symptoms and had swabs taken for testing.
通过对多品种煤进行化验、计算和优化，分析了其特性指标之所以差异很大的原因。
The test, calculation and optimization are carried out for various coals and the reasons caused different performance index of them are analyzed.
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