problem
[名词]
something that causes difficulties and is hard to overcome

问题, 难题
Ex: There was problem with the delivery , and the package did n't arrive on time .
excuse me
[感叹词]
said before asking someone a question, as a way of politely getting their attention

打扰一下, 请问一下
to arrive
[动词]
to reach a location, particularly as an end to a journey

到达, 抵达
Ex: We left early to ensure we arrive at the concert venue before the performance began .
activity
[名词]
something that a person spends time doing, particularly to accomplish a certain purpose

活动, 行为
Ex: Solving puzzles and brain teasers can be a challenging but activity.

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