'Get a grip (on yourself)' = control your emotions
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GSGSIs that the idiom has several meanings?No; you must simply interpret it more broadly: here, 'control one's understanding; comprehend''.
GSGSSo it's mean here "to understand/comprehend china's investments"?I cannot read any more of that text without subscribing, but it seems to mean to understand China's investment strategy and think about how to deal with it if it is counterproductive to other economies.