家に入るとき、私はマットにつまずいた。
tbd
I tripped over the mat when I came in the house.
Entering the house, I tripped over the mat.
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つまずく， つまづく， 躓く
1. to trip (over), to stumble
2. to fail, to suffer a setback
绊倒；失败, 遭受挫折
家， いえ
1. house, residence, dwelling
2. family, household
3. lineage, family name
房子，住宅；家；家族
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd