Start with the mobile version and set the "spelling" mode. But it is not good to practice from spelling as soon as a word is given. In the end, I found that many words were in a state where the spelling was still remembered, but the meaning was forgotten, so I transferred back to the "recognition" mode, but the word interpretation like scallop god made the experience of memorizing words very poor. Often, a string of meanings is paid under a word, but many of them are "connotation" and "denotation" are far behind. Sometimes even the emotional color or the Chinese interpretation of the object of use will be very different from the English words. Later, it was unexpectedly discovered that the web version can re-edit the interpretation by itself, if it is a treasure. I immediately abandoned the mobile version, but the web version didn't have spelling review (not completely, there was a spelling test button in the word interface, but it didn't work), and gradually I felt that it was not enough to rely on "recognition", so I prepared a piece of paper, wrote a definition for every word, and then silently spelled the just word against the copied definition every four or five words, but I didn't know if I had spelled it correctly, so I experienced it.