An apparatus to promote gas-liquid contact and facilitate enhanced mass transfer. The system includes a power routing subsystem coupled to the source and grid, and adapted to operate in a bypass mode, in which energy is transferred from the source to the grid. Regarding the contact hole, only a side wall portion intersecting a direction of the wire groove has a substantial taper angle. The second coil is configured to receive electrical energy from the first coil through magnetic interaction. An acquiring unit acquires the encryption key from the storage unit by using the terminal identifier of the first terminal. A gate oxide film is formed thinly along the lateral surfaces of a trench at a uniform thickness.