Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Hong Kong (CNN) New satellite imagery of China's first overseas military base reveal it to be bigger and more secure than previously thought. Two images provided by Stratfor Worldview and Allsource Analysis show the base in Djibouti, located at a strategic choke point on the Horn of Africa, to be heavily fortified with three layers of security and has about 23,000 square meters (about 250,000 square feet) of underground space, according to analysis provided by Stratfor. "This type of construction is in line with known Chinese practices in hardening their military bases. The underground structures allow for unobserved activity, as well as offer protection to vehicles or facilities critical to the Chinese mission in Djibouti," Stratfor, a geopolitical intelligence firm, said in an analysis accompanying the images.The base is China's first permanent overseas military installationIt has nearly 250,000 square feet of underground space 
 Question:A dock will likely be constructed eventually, and _ could use Djibouti's commercial port until that time, according to Stratfor.

China