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The green arrow at the bottom indicates that it can be passed. Some ticket gates are two-way. When someone comes towards him, the green arrow will turn into a red fork.　　带你进入坚强背后的脆弱与不堪BT in BT investment mode is the abbreviation of build-transfer, which is a kind of rich investment mode created or simplified by Yan Jiehe, a dark horse tycoon on the 2005 Rich List. Compared with BOO (construction-operation-operation) and BOOT (construction-ownership-operation-transfer), BT investment mode has less operation link for the construction party. Its essence is the transformation of BOT (build-operation-transfer) mode, which means that the project management company advances funds to carry out the construction after the general contract, and then transfers the construction to the government department after the construction acceptance is completed. That is to say, advance funds to build infrastructure projects that the Government cannot start for the time being, and then let the Government repay in installments, thus making huge profits.If it is not in any component, the starting coordinate of the map starts with the coordinate axis as the origin (i.e. The object moves while the map does not move).请听 -- 吴青峰7 Respiratory system