 美 
											['ɡruːəlɪŋ]
										
													美 
											['ɡruːəlɪŋ]
																 
										
							
																																	"worked their arduous way up the mining valley"
																							"a grueling campaign"
																							"hard labor"
																							"heavy work"
																							"heavy going"
																							"spent many laborious hours on the project"
																							"set a punishing pace"
																															
Lendl's training programme is so gruelling that few people could keep up with it.
出自:Tennis
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