Today's Sentence
Video not in English?We used to think that tool use was our defining human characteristic, until we saw chimps do it.
Original Video:Will We Ever Run out of Oil?
Key Vocabulary
1. characteristic
characteristic
[ˌker.ək.təˈrɪs.tɪk](n.)

Claire Wu8 months ago
URA5 months ago
Eason Lee (EasonLee)6 months ago
lily jiang 6 months ago
Derek Chang7 months ago
HS7 months ago
el7 months ago
MariaSan7 months ago
soleilwang01177 months ago
Hsing-Sheng Wang7 months ago
Total
3103
Challenges Completed