The song plays during the closing sequence of Michael Jackson's film of the same name and will be included on a companion 2-disc CD set.
这首单曲将作为杰克逊电影《This is It》的片尾曲，并收录进杰克逊的双cd套装专辑。
2
It features a primary check valve utilizing a rubber disc seating against a mating rubber part to ensure tight closing.
其特点在于第一止回阀采用一个橡胶阀瓣密合在相配的橡胶部件上，确保紧密的关闭。
3
Gate valves are offered in two designs: Parallel Disc and Flexible Wedge. Parallel Disc are position seated; Flexible Wedge are torque seated when closing.