1 Subjects: “...back conversion pathway...”

2 Subjects: “...land back...”

3 Subjects: “...back-propagation neural network (BPNN)...”

4 Subjects: “...back-propagation neural network...”

5 Subjects: “...back-filling concrete...”

6 Subjects: “...back squat...”

7 Subjects: “...back-of-queue model...”

8 Subjects: “...build back better...”

9 Subjects: “...back calculation of modulus...”

10 Subjects: “...die-back of poplars...”

11 Subjects: “...fall-back strategy...”