焊接前需要先在接缝处涂上焊剂。
You need to apply ___flux to the joint before soldering.
他们正在监测通过太阳能板的能量流动速率。
They are monitoring the ___fluxes of energy through the solar panels.
搬家后的第一天，整个房间都还在整理中。
On the first day after moving, the whole room was in ___flux.
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