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Such extrem cases must probably be taken with a grain of sault, but they do underline the general principle that the relationship between elephant and mahout is the key to successful training.
Is the sentence the same meaning if I take off "probably"?
Thanks in advance!
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Hi,
No.

Must indicates 100% necessity.

Must probably indicates a high % of necessity, but less that 100%.

Clive
Comments  
Thank you very much! ^_^