央行公布4月中央银行各项工具流动性投放情况

Used to introduce findings or information from data/reports. '数据显示' (data shows) is followed by a comma, then the specific information. Common in formal writing and news reports.

'净' (net) + verb + amount is used to express net figures in financial/economic contexts. Negative amounts are shown with a minus sign directly before the number.

'方面' means 'aspect' or 'regard'. Used to introduce a new topic area or category in formal discourse. Pattern: [topic]方面，[statement about that topic].

'获悉' (learn/be informed) is a formal way to introduce information received. Common in news reports. Pattern: [source]获悉，[information].

'公布' (announce/publish) is followed directly by the object being announced, typically official data or decisions. No particle needed between verb and object in formal contexts.