1.He assured me that it really happened, but I reckon he was just pitching me a line.

1.言之凿凿地说确有其事，可是我觉得在说。

2.He was pitching the ball.

2.在投球。

3.Researchers can precisely measure previously unquantifiable aspects of pitching—everything from the angular velocity of the arm at the shoulder joint to tension on the knees and elbows.

3.研究者可以确地测出先前无法的各种有关投球方面的数据——从肩关节部位手臂移动角度的速度，到膝盖和手肘的张力。