The paper aims to study the effect of fly ash on concrete to sulphate attack.

研究了粉煤灰对混凝土抗硫酸盐侵蚀性能的影响。

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Many shooters do appear to plan their attack over time, Ash said.

CNN: Rejection, bullying are risk factors among shooters

Seminars are being held to offer landowners and tree planters advice and guidance about how to deal with the fungal spores which attack young saplings and mature ash trees.

BBC: Ash dieback: More positive tests in Carmarthenshire