To introduce, one stage at a time.
分階段引介：一階段一個(gè)地引入
To bring or come to an end, one stage at a time.
逐步撤除：一次一個(gè)階段地結(jié)束
being or happening in (or out of) synchrony or harmony
（不）同相的（地）；（不）同步的（地）；（不）協(xié)調(diào)的（地）
the cabling work should be carried out &B{in phase with} the building work.
電纜工程應(yīng)當(dāng)與建筑工程同步進(jìn)行。
In a correlated or synchronized way.
按階段：用相關(guān)的或同步的方式
In an unsynchronized or uncorrelated way.
不分階段：用不同步的或不相關(guān)的方式