to not feel confident or certain about something
не чувствовать себя уверенным или уверенным в чем-то (ne chuvstvovat' sebya uverennym ili uverennym v chem-to)
"I’m unsure of what to say in that situation."
"Я не уверен, что сказать в этой ситуации." (Ya ne uveren, chto skazat' v etoy situatsii.)
to manage with something less than ideal
to create a sense of calm and balance in your mind
to trust someone or something to do what is expected or need...
to indicate or suggest a future possibility
to reduce the amount of something harmful, especially pollut...
to improve your knowledge or skills that you already learned
