由…决定英语短语是be determined by。be determined by的例句：A disease can often be determined by its manifestations（疾病往往可以通过它的现象而诊断出来）。

be determined by的例句：These limits can only be determined by law（此等限制仅得由法律规定之）；Regulatory processes will be determined by region（法规过程将由各区域确定）。