土: earth, dust...
挣扎: to struggle...
下功夫: work hard...
主导: leading, dominant, prevailing, to lead, to direct, to dominate...
例子: case, (for) instance, example...
关闭: to close, to shut...
薄: thin, cold in manner, indifferent, weak, light, infertile...
苦笑: to force a smile, a bitter laugh...
激光: laser...
高手: expert, past master, dab hand...
