balsa

Balsa is a light wood.

西印度是一种很材

The children were asked to model an airplane out of balsa-wood.

孩子被要求用做模型飞机。

In May of 1953, the balsa wood strips were again removed, and the X-4's dynamic stability was studied in the original flap/speed brake and elevon configuration.

1953年5月，加装条再次被移除，人开始研究X-4“副翼/刹车片和升降舵辅助翼”布局稳定性。

1953年5月，加装条再次被移除，人开始研究X-4“副翼/刹车片和升降舵辅助翼”布局稳定性。

In May of 1953, the balsa wood strips were again removed, and the X-4's dynamic stability was studied in the original flap/speed brake and elevon configuration.

The thickened flap/speed brake tests had been encouraging, so balsa wood strips were reinstalled on both the flap/speed brake and the elevons.

增厚副翼/刹车片测试令人满意，于是条又被重新安装到了副翼/刹车片和升降舵辅助翼上去。