求翻译：　TC-620在原防尘防水网的基础上增加一个防护钢网，提高了对外界冲击力的防护作用，有效的保护了防尘防水网和喇叭。是什么意思？

tc-620 to add a protective steel mesh on the basis of the original dust and water network, to improve the protective effect of external impact, effective protection dustproof and waterproof mesh and speakers.

TC - 620 in the original protection against dust and water network on the basis of a protective steel line, to improve the impact protection, effective protection against dust and water-horn.

　TC-620 in original dustproof guards against the network of rivers and lakes in the foundation to increase a protection steel mesh, enhanced to the outside impulse protection, the effective protection dustproof has guarded against the network of rivers and lakes and the loudspeaker.

　TC-620 in original dust-proof net increase on the basis of a protective steel mesh, improving protection against external impact, effective protection of dust-proof net and Horn.

正在翻译，请等待...