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Spaß muss sein:  Die folgende Erklärung zu oft gefundenen Phrasen ist nicht ganz ernst gemeint, eröffnet aber nützliche Einblicke zum besseren Verständnis wissenschftlicher Texte.
                                 

When scientists write ...

they really mean
It has long been known that ... I have not bothered to look up the original reference.  
While it has not been possible to provide a definite answer to these questions  ... The experiments did not work out, but i figured to get at least a publication out of it.

High purity ....,

Very high purity ...,

Extremely high purity ... ,

 Composition unknown except for the exaggerated claims of the supplier.
Three of the samples were chosen for detailed analysis. The results on the others did not make sense and were ignored.
.... accidently strained during mounting  ... dropped on the floor.
... handled with extreme care throughout the experiment.    ... not dropped on the floor.
... typical results are shown ....   ... we show results that support our idea ....
... detail has been lost in reproduction, it is clear from the original micrographs ..... our micrographs do not really show what we think it should show ...  
Presumably at longer times ... I did not take the time to find out.

It is suggested that ....,

It is believed that ... ,

It may be that ... ,

 I think ...
It is generally believed that ... Other people think so, too.
It might be argued that ... I have such a good idea on this objection, that now I shall raise it.
Much additional work will be required before a complete understanding ... We do not understand .... .  
A quantitative theory to account for these phenomena has not been formulated ... Neither does anyone else.
We hope that these results will stimulate further work in the field This paper is not very good, but neither are any of the others in this miserable field
We anticipate that this work will stimulate ... I want others to carry on with the project, while I …