- 
				           		外表面必须喷砂。
						        					            	 Surfaces must be sandblasted.
								    										 
								    				            	 youdao 
- 
				           		所有表面必须无油脂、水分或其它杂质,然后才能喷砂。
						        					            	 All surfaces must be free of oil, grease, moisture another foreign matter prior to blasting.
								    										 
								    				            	 youdao 
- 
				           		所有表面必须无油脂、水分或其它杂质,然后才能喷砂。
						        					            	 All surfaces must be free of oil, grease, moisture another foreign matter prior to blasting.
								    										 
								    				            	 youdao