0 a liquid such as oil that is used to make the parts of an engine move easily together, or a substance put on any surface to help it move more easily against another one -- 润滑油；润滑剂
While manipulating the spermatophore, the male also secretes saliva, which is believed to serve as a lubricant.
Thus, velocity profiles show that the lubricant does not support the shear effects at all.
To minimize contamination problems for geochemical and isotopic analyses, we avoided the use of drilling lubricants containing organic materials.
The task is not simple, as the production of the lubricant requires collective action of the dense bacterial population that the food-depleted substrate cannot sustain.
Of course, weak consensus is the lubricant of choice.
I do not deny that emotions also play a part in negotiations, but their role is only that of a lubricant.
However, in some applications, the lubricant cannot be considered as a single fluid and a multifluid approach has to be introduced.
Figure 7 shows that the flow is stable when the lubricant is heavier than the core fluid and unstable when lighter.
