“按条件”常见的英文表达有 “according to the conditions” 或 “based on the conditions” 。
according to the conditions：强调完全依据所设定的条件来进行操作、判断或行动。例如：We will select candidates according to the conditions set in the job advertisement.（我们将根据招聘广告中设定的条件来挑选候选人。）
based on the conditions：侧重于以条件为基础、作为依据来做出决定或采取行动。例如：The decision was made based on the current market conditions.（这个决定是根据当前的市场条件做出的。 ）