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乗り換える， 乗りかえる， 乗換える， 乗り替える， 乗替える， のりかえる
1. to transfer (trains), to change (bus, train)
2. to change (to another ideology, party, company, etc.), to switch (to a different system, method, etc.), to move on to (e.g. a new love interest)
tbd
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なくてはならない， 無くてはならない
1. cannot do without something, indispensable, absolutely necessary
2. have to do
必不可少，绝对必要；必须
で
1. at, in
2. at, when
3. by, with
4. within, in
5. and then, so
6. and, then
7. let me tell you, don't you know
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