Apparatus and methods related to umbilical buckling testing are described. An electro-optical element emits light in response to the driving current. The eraser shell consists of a piece of erasing cloth, a piece of air-permeable sponge, a base plate, and a group of air-permeable papers. The display controller is configured to, when playing back the program recorded by the recorder, perform control to display the comment classified by the classifier as a comment on the program, and the program. The wire winding machine includes a portable operator console, and a network interface. The implanted species interact with the Silicon matrix of the substrate to establish field isolation areas that extend deeper than the buried oxide layer of the SOI device, to ensure adequate component isolation.