To table something means to set it aside to be considered later, not at the time it is brought up or suggested. The sentence means that ideas and suggestions that have been set aside this way at formal meetings must be voiced and dealt with at the appropriate times. The appropriate times might be when people who are more knowledgeable or more expert are in attendance. Say somebody makes a suggestion at a formal meeting to spend money on remodeling a building. However, the person that is most expert on building and remodeling prices is not attending the meeting. The suggestion might be tabled (set aside) until the right people can meet with the building expert to estimate a price. This might not happen at a formal meeting of the group.

正式的会议上，在适当时候说出自己的想法和提出建议是重要的。